US Patent Class 138
PIPES AND TUBULAR CONDUITS



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Current as of: June, 1999
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  DF  CLASS NOTES
26  DF  WITH PRESSURE COMPENSATORS
27  DF  .~ Freeze protecting
28  DF  .~.~ Expansible or compressible tube element
30  DF  .~ Variable capacity chambers
31  DF  .~.~ Piston or plunger type
32  DF  THAWING AND FREEZE PROTECTION
33  DF  .~ Electric
34  DF  .~ Anti-freeze substance
35  DF  .~ Portable thawing apparatus
36  DF  WITH WEAR INDICATOR
37  DF  WITH FLOW REGULATORS AND/OR BAFFLES
38  DF  .~ Heat transfer
39  DF  .~ Flow facilitating
40  DF  .~ Restrictors
41  DF  .~.~ With screen
42  DF  .~.~ Tortuous path
43  DF  .~.~.~ Variable restriction
44  DF  .~.~ Central path
45  DF  .~.~.~ Variable restriction
46  DF  .~.~ Variable restriction
89  DF  WITH CLOSURES AND PLUGS
*  DD  .~ Inflation stem type
89.1  DF  .~.~ Air and dust cap
89.2  DF  .~.~.~ Combined
89.3  DF  .~.~ Air cap
89.4  DF  .~.~ Dust cap
90  DF  .~ Test plugs
91  DF  .~ Double end
92  DF  .~ Lateral opening
93  DF  .~ Inflatable
94  DF  .~ Laterally insertable
94.3  DF  .~.~ Line blinds
94.5  DF  .~.~.~ Pivoted
95  DF  .~ Return bend type
96 R  DF  END PROTECTORS
96 T  DF  .~ Threaded
97  DF  REPAIRING
98  DF  .~ Patches
99  DF  .~.~ External
100  DF  BREAKJOINT
101  DF  .~ Distinct layers
102  DF  .~ With base
103  DF  COMBINED
104  DF  .~ With indicating means
105  DF  .~ With trench
106  DF  .~ With external support structure
107  DF  .~.~ Suspended
108  DF  .~ With means to support disparate element therein
109  DF  .~ With end structure
110  DF  .~ With hose protector
111  DF  PLURAL DUCT
112  DF  .~ With spacer and encircling element
113  DF  .~ Surrounding radially spaced duct with axially spaced supports for internal duct
114  DF  .~ Coaxial
115  DF  .~ Longitudinally extending common wall
116  DF  .~.~ Distinct
117  DF  .~.~ Complementary sections
118  DF  FLEXIBLE
118.1  DF  .~ Casing
119  DF  .~ With means for facilitating collapse
120  DF  .~ Joined sections
121  DF  .~ Corrugated
122  DF  .~.~ Spirally
123  DF  .~ Braided, interlaced, knitted or woven
124  DF  .~.~ Distinct layers
125  DF  .~.~.~ Plastic
126  DF  .~.~.~.~ Rubber
127  DF  .~.~.~.~.~ With metal
128  DF  .~ Longitudinally seamed
129  DF  .~ Spirally wound material
130  DF  .~.~ Oppositely wound
131  DF  .~.~ Metal core
132  DF  .~.~ Embedded
133  DF  .~.~.~ Metal
134  DF  .~.~ Metal
135  DF  .~.~.~ With interlocked or clamped edge
136  DF  .~.~.~.~ Packed or sealed
137  DF  .~ Distinct layers
138  DF  .~.~ With intermediate metal element
139  DF  .~.~ Metal liner
140  DF  DISTINCT LAYERS
141  DF  .~ Bonded to each other
142  DF  .~.~ Brazed, soldered or welded
143  DF  .~.~ Metal
144  DF  .~.~ Spirally wound layer
145  DF  .~ Coated
146  DF  .~.~ Diverse coating material
147  DF  .~ With mechanical means to hold layers in contact
148  DF  .~ Spaced
149  DF  .~ With intermediate insulation layer
150  DF  .~ With spiral seam
151  DF  .~ With longitudinal seam
152  DF  .~.~ Material of one layer passing through seam
153  DF  .~ Reinforced
154  DF  SPIRALLY SEAMED
155  DF  JOINED SECTIONS
156  DF  LONGITUDINALLY SEAMED
157  DF  .~ Sectional
158  DF  .~.~ With separate mechanical securing means
159  DF  .~.~.~ Bolt, nail, rivet or screw
160  DF  .~.~.~.~ Radially extending
161  DF  .~.~.~ Externally encircling
162  DF  .~.~ Tongue and slot
163  DF  .~.~ Bent over lip or flange
164  DF  .~ With packing
165  DF  .~ With wedge
166  DF  .~ With tongue in slot
167  DF  .~ With diverse locking means
168  DF  .~ With interlocking hooks
169  DF  .~ Diversity of seam
170  DF  .~ Permanent type seam
171  DF  .~.~ Brazed, soldered or welded
172  DF  REINFORCED
173  DF  .~ Corrugated
174  DF  .~ With embedded element
175  DF  .~.~ Clay, concrete or masonry
176  DF  .~.~.~ Reinforcement under tension
177  DF  STRUCTURE
178  DF  MISCELLANEOUS
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DIGESTS
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DIG 1  DD  Adhesive
DIG 2  DD  Glass fiber
DIG 3  DD  Teflon, Kel-F
DIG 4  DD  Air conditioning
DIG 5  DD  Pre-stress
DIG 6  DD  Corrosion
DIG 7  DD  Resins
DIG 8  DD  Bent shaped retained
DIG 9  DD  Cellular
DIG 10  DD  Metal foil
DIG 11  DD  Shape