US Patent Class 338
ELECTRICAL RESISTORS



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Current as of: June, 1999
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  DF  CLASS NOTES
1  DF  COHERER TYPE
2  DF  STRAIN GAUGE TYPE
3  DF  .~ With temperature compensation
4  DF  .~ Fluid- or gas pressure-actuated
5  DF  .~ Dynamometer type
6  DF  .~ Extensometer type
7  DF  RESISTANCE VALUE TEMPERATURE-COMPENSATED
8  DF  .~ Temperature-compensated actuator
9  DF  .~ With additional compensating resistor or resistance element
10  DF  .~.~ Filament or wire resistance elements
11  DF  REFLECTOR DIRECTS HEAT ON ELEMENT
12  DF  MOVABLE MAGNET ACTUATES RESISTOR THROUGH HOUSING OR PARTITION
13  DF  RESISTANCE VALUE RESPONSIVE TO A CONDITION
14  DF  .~ Plural conditions
15  DF  .~ Photoconductive (e.g., light sensitive)
16  DF  .~.~ With vibration control
17  DF  .~.~ Plural resistance elements (e.g., mosaic)
18  DF  .~.~ Infrared radiation
19  DF  .~.~ With transparent housing
20  DF  .~ Current and/or voltage (e.g., ballast resistor)
21  DF  .~.~ Voltage surge-responsive or lightning arrester type
22 R  DF  .~.~ Thermistor type
23  DF  .~.~.~ Indirectly heated
22 SD  DF  .~.~.~ Semiconductor
24  DF  .~.~ Indirectly heated
25  DF  .~ Ambient temperature
26  DF  .~.~ Cable or tape type (e.g., fire-detecting cable)
27  DF  .~.~ Liquid contact or element
28  DF  .~.~ Probe type
29  DF  .~.~.~ Mechanically adjustable or variable
30  DF  .~.~.~ Terminal forms casing or housing
31  DF  .~.~ Mechanically adjustable or variable
32 R  DF  .~ Magnetic field or compass (e.g., Hall effect type)
32 H  DF  .~.~ Hall effect
32 S  DF  .~.~ Superconductors
33  DF  .~ Float actuator
34  DF  .~ Gas, vapor, or moisture absorbing or collecting
35  DF  .~.~ Humidity
36  DF  .~ Fluid- or gas pressure-actuated
37  DF  .~.~ Vehicle tire inflation
38  DF  .~.~ Liquid resistance element or contact
39  DF  .~.~ Piston
40  DF  .~.~ Bourdon tube
41  DF  .~.~ Bellows or capsule
42  DF  .~.~ Diaphragm
43  DF  .~ Gravity stabilized or inertia actuator
44  DF  .~.~ Liquid resistance element or contact
45  DF  .~.~ Centrifugal
46  DF  .~.~ Pendulum
47  DF  .~ Force-actuated
48  DF  PLURAL SEPARATE DIVERSE RESISTORS
49  DF  SHUNT TYPE
50  DF  MOUNTED ON WHEELS OR VEHICLE
51  DF  WITH HEAT DISSIPATING PROJECTIONS (E.G., VANES)
52  DF  .~ Granular, powdered, or transversely stacked resistance element
53  DF  WITH COOLING GAS OR LIQUID CIRCULATION
54  DF  .~ Element granular, powdered, or stacked between terminals
55  DF  .~ With cooling liquid circulation
56  DF  .~.~ Liquid resistance element circulates
57  DF  .~ Vented or ventilating casing or housing
58  DF  .~ Ventilated helical or zigzag element
59  DF  WITH HEAT-STORING
60  DF  WITH CAPACITY-REDUCING
61  DF  WITH INDUCTANCE-REDUCING
62  DF  .~ Helical or wound element
63  DF  .~.~ Bifilar
64  DF  WITH ELECTRICAL SHIELD
65  DF  .~ Mechanically variable resistor
66  DF  IGNITION INTERFERENCE SUPPRESSOR TYPE
67  DF  WITH DIVERSE NONELECTRICAL DEVICE (E.G., MECHANICAL OR CHEMICAL)
68  DF  MECHANICALLY VARIABLE (E.G., RHEOSTAT)
69  DF  .~ Musical instrument playing key actuated
70  DF  .~ In or on lamp socket
71  DF  .~.~ Resistor surfaces pressed together (e.g., compressible type)
72  DF  .~.~ Resistor with intervening connector between contact and element (e.g., taps)
73  DF  .~.~ Resistor with contact angularly slidable on element
74  DF  .~.~ Resistor with contact rectilinearly slidable on element
75  DF  .~ With resistor cleaner
76  DF  .~ Interchangeable resistors of different resistance value
77  DF  .~ Plug boxes
78  DF  .~ With current reversing (e.g., reversing rheostat)
79  DF  .~ With element winding and/or unwinding
80  DF  .~ Liquid resistance element
81  DF  .~.~ Electrode separable from liquid element for switching
82  DF  .~.~ Adjustable insulating barrier between electrodes
83  DF  .~.~ Variable electrode separation
84  DF  .~.~.~ Plural ganged electrodes
85  DF  .~.~.~ Electrode rotatable
86  DF  .~.~ Level of liquid element adjustable on electrodes (e.g., electrodes move up and down in element)
87  DF  .~ Contact adjustably inserted into resistance element (e.g., penetrating type)
88  DF  .~.~ Powdered element
89  DF  .~ Mathematical function (e.g., sine-cosine potentiometer)
90  DF  .~.~ With slab or card-type resistance element
91  DF  .~.~ With mechanical converter
92  DF  .~ Resistance element adjustably short-circuited
93  DF  .~.~ Compressible spring type
94  DF  .~.~ Liquid contact
95  DF  .~.~ With intervening structure between element and short-circuiting means (e.g., taps)
96  DF  .~.~ Spring contact strip progressively pressed along element
97  DF  .~.~ Unitary movable contact electrically bridges resistance portions
98  DF  .~ With motion or vibration damping means (e.g., dashpots)
99  DF  .~ Surfaces pressed together (e.g., compressible type)
100  DF  .~.~ Granular
101  DF  .~.~ Pile type
102  DF  .~.~.~ With contactor moving along pile
103  DF  .~.~.~ With electromagnetic operator (e.g., electric motor)
104  DF  .~.~.~.~ Force applied at both ends of pile
105  DF  .~.~.~.~ With diaphragm-type biasing spring
106  DF  .~.~.~.~ With initial pressure adjustment
107  DF  .~.~.~ With electromagnetic holder
108  DF  .~.~.~ Pedal- or treadle-operated
109  DF  .~.~.~ With initial pressure adjustment
110  DF  .~.~.~ With switch actuated by resistor actuator
111  DF  .~.~.~ With intervening conducting structure
112  DF  .~.~.~ Contact surface area of piles variable
113  DF  .~.~.~ With resilient pressure-applying linkage
114  DF  .~ Deformable
115  DF  .~ Element in piled or stacked layers
116  DF  .~ With electromagnetic operator (e.g., electric motor)
117  DF  .~ Slidable coextensive helical and linear contacts
118  DF  .~ Movable contact electrically adjustable over length of resistance element
119  DF  .~.~ With contact position indicating lamp
120  DF  .~.~ Additional resistor adjustably shunts part of resistance element (e.g., varifunction type
121  DF  .~.~ With nonlinearity correction
122  DF  .~.~ Coarse and fine resistance elements
123  DF  .~.~.~ Plural elements and plural contacts
124  DF  .~.~.~.~ Contacts interlinked (e.g., lost motion type)
125  DF  .~.~ Unitary movable contact electrically bridges plural resistance elements
126  DF  .~.~.~ Elements or taps in parallel
127  DF  .~.~.~ Contact rotates between circularly arranged elements or taps
128  DF  .~.~ Plural
129  DF  .~.~.~ Sequentially operated
130  DF  .~.~.~ Ganged
131  DF  .~.~.~.~ Resistors individually adjustable
132  DF  .~.~.~.~ Resistors in tandem along rotary shaft or coupling
133  DF  .~.~.~.~ Rectilinearly operated
134  DF  .~.~.~ Individually operated concentric shaft type
135  DF  .~.~ With zero setting or phasing
136  DF  .~.~ Contact clamped on resistance element
137  DF  .~.~ Plural contacts adjustable over single resistance element
138  DF  .~.~ Element tapered
139  DF  .~.~.~ Portion of element shorted
140  DF  .~.~.~ With intervening connector between contact and element (e.g., taps)
141  DF  .~.~.~ Helical or wound
142  DF  .~.~.~ Element forms a coating
143  DF  .~.~ Contact moves along turns of helical resistance element
144  DF  .~.~.~ Contact lifts element from core
145  DF  .~.~.~ Helical resistance element moves
146  DF  .~.~.~ With helical collector parallel to helical element
147  DF  .~.~.~ Resistor formed as a flat spiral
148  DF  .~.~.~ With helical screw for moving the contact
149  DF  .~.~.~ With contact stop
150  DF  .~.~ Resistance element moves
151  DF  .~.~.~ With liquid contact
152  DF  .~.~.~ With knob mounting or enclosing the element
153  DF  .~.~ Contact operated by pedal or treadle
154  DF  .~.~ With a flexible conductive strip separating the movable contact and the resistance element or taps
155  DF  .~.~ Contact rocks along element or taps
156  DF  .~.~ With liquid contact
157  DF  .~.~ Contact rolls along element or taps
158  DF  .~.~.~ Contact rolls rectilinearly
159  DF  .~.~ With heat conducting or distributing path
160  DF  .~.~ Contact slides along in contact with element
161  DF  .~.~.~ With element casing open over contact track
162  DF  .~.~.~ Contact angularly slidable
163  DF  .~.~.~.~ With knob forming casing or covering
164  DF  .~.~.~.~ Hermetically sealed housing
165  DF  .~.~.~.~ With elongated rectilinear resistance element
166  DF  .~.~.~.~ With removable actuating shaft or key
167  DF  .~.~.~.~ Spring-loaded contact
168  DF  .~.~.~.~ With flexible lead-in to contact
169  DF  .~.~.~.~ Contact pressure adjustable
170  DF  .~.~.~.~ With contact biasing spring on contact arm or carrier
171  DF  .~.~.~.~ With plural contact portions
172  DF  .~.~.~.~ With switching
173  DF  .~.~.~.~.~ Contact separable from resistance element
174  DF  .~.~.~.~ With collector ring
175  DF  .~.~.~.~.~ Ring, a shaft-bearing
176  DF  .~.~.~ Contact rectilinearly slidable
177  DF  .~.~.~.~ Contact surrounds resistor
178  DF  .~.~.~.~ Contact separable from element for switching
179  DF  .~.~.~.~ With series switch
180  DF  .~.~.~.~ Screw-operated
181  DF  .~.~.~.~.~ Screw, a fine-adjustment
182  DF  .~.~.~.~ With contact lock
183  DF  .~.~.~.~ With collector bar
184  DF  .~.~ With housing
185  DF  .~.~ With intervening connector between contact and element (e.g., taps)
186  DF  .~.~.~ Connector formed as severed helical turns or as comb teeth
187  DF  .~.~.~ With arc suppressor
188  DF  .~.~.~ With collector bar or ring
189  DF  .~.~.~ With magnetic holder for controller arm
190  DF  .~.~.~ Angularly movable contact
191  DF  .~.~.~.~ With switch
192  DF  .~.~.~.~ Resistance element enclosed
193  DF  .~.~.~.~.~ Enclosure formed on and hardened on element
194  DF  .~.~.~ Rectilinearly movable contact
195  DF  .~ Resistance value varied by removing or adding material
196  DF  .~ With resistor actuator position indicator
197  DF  .~ With support
198  DF  .~ With switch actuated by resistor actuator
199  DF  .~ With housing
200  DF  .~ With switch
201  DF  .~.~ Switch connects plural elements in parallel
202  DF  MOVABLE CONTACT STRUCTURE
203  DF  READILY SEVERABLE INTO INDEPENDENT RESISTORS
204  DF  ELEMENT IN LAYERS PILED OR STACKED BETWEEN TERMINALS
205  DF  .~ With intervening conducting layer
206  DF  EXPANDED METAL TYPE
207  DF  ELEMENT AND BASE PERMANENTLY FOLDED OR ROLLED
208  DF  MESH, WOVEN, OR BRAIDED RESISTANCE ELEMENT
209  DF  EXTENSIBLE
210  DF  FLEXIBLE OR FOLDING
211  DF  .~ Element coated on flexible base
212  DF  .~ Tape or sheet
213  DF  .~ Beaded
214  DF  .~ Cable type
215  DF  WITH SWITCH
216  DF  IN COAXIAL TRANSMISSION LINE OR WAVE GUIDE
217  DF  TAPERED ELEMENT
218  DF  .~ Helical or wound
219  DF  IN OR ON LAMP SOCKET OR BASE
220  DF  IN DETACHABLE ELECTRICAL CONNECTOR
221  DF  DETACHABLE PLUG-TYPE RESISTOR UNIT
222  DF  WITH LIQUID ELEMENT
223  DF  GRANULAR OR POWDERED ELEMENT
224  DF  .~ Granular or powdered mixtures
225  DF  .~ Carbon particles
226  DF  INCASED, EMBEDDED, OR HOUSED
227  DF  .~ With resistance value indicator
228  DF  .~ Casing extends through plate
229  DF  .~ Probe type
230  DF  .~ Metal casing or housing cast around element
231  DF  .~ In liquid
232  DF  .~ Casing or housing readily openable and/or separable from element
233  DF  .~.~ Elongated casing or housing with plug, disc, or cap at end
234  DF  .~ With gaseous or vacuum spacing between element and casing or housing
235  DF  .~.~ Plural elements or resistors
236  DF  .~.~ Spacing of uniform thickness over length of element
237  DF  .~.~.~ Hermetically sealed
238  DF  .~ Element inpowdered insulation with outer metallic sheath
239  DF  .~.~ Plural elements or resistors
240  DF  .~.~ Terminals or leads adjacent
241  DF  .~.~.~ Sheath only outside looped element
242  DF  .~.~ Shape of sheath
243  DF  .~ Element in insulation with outer metallic sheath
244  DF  .~.~ Insulation coated on conducting liner
245  DF  .~.~ Entire insulation or sheath formed as a coating
246  DF  .~.~ With insulation and sheath external and internal to element
247  DF  .~.~ Plural part sheath
248  DF  .~.~.~ Insulation formed and hardened in situ (e.g., molded)
249  DF  .~.~.~ Parts formed as flat sheets
250  DF  .~.~ Insulation formed and hardened in situ (e.g., molded)
251  DF  .~.~ Sheath embraces or folds over insulation
252  DF  .~ Element embedded or enclosed in groove or recess
253  DF  .~.~ With filling hardened in situ
254  DF  .~ Flattened resistance element between flat layers
255  DF  .~.~ Layers coalesced or fused together
256  DF  .~ Casing or housing formed in plural layers external to element
257  DF  .~.~ One layer a coating
258  DF  .~ Resistance element formed as a coating on interior of casing or housing
259  DF  .~ Wound, braided, or woven casing or housing
260  DF  .~ Plural resistors
261  DF  .~.~ Helical or wound element
262  DF  .~ Casing or housing formed as a coating
263  DF  .~.~ Helical or wound element
264  DF  .~.~.~ Element coiled on a core
265  DF  .~.~.~.~ Terminal or leads at one end of core
266  DF  .~.~.~.~ Terminal surrounds element and/or core
267  DF  .~ Helical or wound element
268  DF  .~.~ Preformed sleeve engaging over element
269  DF  .~.~ Casing or housing formed on and hardened on resistor (e.g., molded)
270  DF  .~.~ Element coiled on a core
271  DF  .~ Terminal forms casing or housing
272  DF  .~ Terminal or lead surrounds and secured to casing or housing
273  DF  .~ Terminal or lead extends into end of elongated casing or housing
274  DF  .~.~ With sealing plug, disc or cap
275  DF  .~ Casing or housing formed on and hardened on resistor (e.g., molded)
276  DF  .~ Terminal or lead extends through casing or housing wall
277  DF  WITH PROTECTING STRUCTURE SPACED FROM ELEMENT OR TERMINAL
278  DF  EDGEWISE COILED HELICAL STRIP RESISTANCE ELEMENT
279  DF  RIBBON RESISTANCE ELEMENT BENT OR CURVED ON FLAT SIDE
280  DF  .~ Zigzag or sinuous
281  DF  .~.~ Element includes integral stiffening structure
282  DF  .~ Helical or wound
283  DF  ZIGZAG OR SINUOUS RESISTANCE ELEMENT
284  DF  .~ Element includes integral stiffening structure
285  DF  .~ Element extends along groove in base
286  DF  .~ Helical
287  DF  .~ Compound or multiple zigzag
288  DF  .~.~ Element includes conductive jumpers or spacers
289  DF  .~ Element includes conductive jumpers or spacers
290  DF  .~ Element projects in or through an opening or a slot in a support or frame
291  DF  .~ With transverse element stiffening or reinforcing rod or strip
292  DF  .~ Element forms a coating
293  DF  .~ Planar
294  DF  .~ Cylindrical
295  DF  PLURAL RESISTANCE ELEMENTS CONNECTED BY A JUMPER OR SPACER
296  DF  HELICAL OR WOUND RESISTANCE ELEMENT
297  DF  .~ Flat spiral winding
298  DF  .~ Compound helix or winding
299  DF  .~ Plural supported helices or windings
300  DF  .~ Element forms a coating
301  DF  .~ Element coiled on flat or ribbon base
302  DF  .~ Element coiled on cylindrical or prismatic core
303  DF  .~.~ In helical groove on core
304  DF  .~ Element on frame or support
305  DF  .~.~ Element extends in or through openings or grooves in frame or support
306  DF  WITH BASE EXTENDING ALONG RESISTANCE ELEMENT
307  DF  .~ Resistance element and/or terminals printed or marked on base
308  DF  .~ Resistance element coated on base
309  DF  .~.~ Terminal coated on
310  DF  .~ Resistance element extends through base
311  DF  .~ Resistance element mounted in a groove in base
312  DF  .~ Terminal extends in or through base
313  DF  .~ Terminal embraces base
314  DF  .~ Resistance element and base formed in layers
315  DF  WITH MOUNTING OR SUPPORTING MEANS
316  DF  .~ Compensates for or permits resistor
317  DF  .~ Threading or projecting through the support
318  DF  .~ Extending between supports
319  DF  .~.~ Plural resistors
320  DF  .~ Plural resistors
321  DF  RESISTANCE ELEMENT CORES AND FRAMES
322  DF  WITH TERMINAL
323  DF  .~ Terminal tapped on resistance element
324  DF  .~ Diverse terminals
325  DF  .~ With three or more terminals
326  DF  .~ Terminals adjacent (e.g., looped resistor)
327  DF  .~ Terminal coated on resistance element
328  DF  .~ Terminal and resistance element disposed in flat layers
329  DF  .~ Welded or soldered
330  DF  .~ Terminal and resistance element integral
331  DF  .~ Resistance element surrounds terminal
332  DF  .~ Terminal embraces or surrounds resistance element
333  DF  PARTICULAR CONFIGURATION AND/OR DIMENSION
334  DF  MISCELLANEOUS
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