US Patent Class 178
TELEGRAPHY



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Current as of: June, 1999
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Internet Version by PATENTEC © 1999       Terms of Use



Products
and
Services

  DF  CLASS NOTES
1  DF  MISCELLANEOUS
2 R  DF  SYSTEMS
3  DF  .~ Automatic
4  DF  .~.~ Printing
4.1 R  DF  .~.~.~ Remote control
4.1 A  DF  .~.~.~.~ Radio-controlled
4.1 B  DF  .~.~.~.~ Called station identification answer back system
4.1 C  DF  .~.~.~.~ Revertive signaling
15  DF  .~.~ Photographic recorder
16  DF  .~.~ Current reversing
17 R  DF  .~.~ Transmitters or recorders
17.5  DF  .~.~.~ Storing
17 A  DF  .~.~.~ Tape and/or keyboard
17 B  DF  .~.~.~ Tape control
17 C  DF  .~.~.~ Keyboard
17 D  DF  .~.~.~ Light, capacity, pneumatic sensing
17 E  DF  .~.~.~ Overlap
18.01  DF  .~ Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry)
18.02  DF  .~.~ Error correction
18.03  DF  .~.~ Writing digitizer pad
18.04  DF  .~.~.~ Acoustical (e.g., vibration, ultrasonic, etc.)
18.05  DF  .~.~.~ Resistive
18.06  DF  .~.~.~ Capacitive
18.07  DF  .~.~.~ Inductive
18.08  DF  .~.~.~.~ Having shield
18.09  DF  .~.~.~ Optical
18.11  DF  .~.~.~ With illumination
19.01  DF  .~.~ Writing digitizer stylus
19.02  DF  .~.~.~ Acoustical stylus
19.03  DF  .~.~.~ Capacitive or inductive stylus
19.04  DF  .~.~.~ Pressure stylus
19.05  DF  .~.~.~ Light pen
19.06  DF  .~.~.~ AC source
19.07  DF  .~.~.~.~ Multifrequency
20.01  DF  .~.~ Writing digitizer circuit
20.02  DF  .~.~.~ Electrical filter or multiplexer
20.03  DF  .~.~.~ Sampling circuit
20.04  DF  .~.~.~ Phase detecting
21  DF  .~ Stenographic
23 R  DF  .~ Printing
24  DF  .~.~ Bulletin
25  DF  .~.~ Page
26.1  DF  .~.~.~ Translators
27  DF  .~.~.~ Selectors
28  DF  .~.~.~ With type-wheel recorder
29  DF  .~.~.~.~ Recorders
30  DF  .~.~ Character elements
31  DF  .~.~ Multiple-line circuit
32  DF  .~.~.~ With type-wheel recorder
33 R  DF  .~.~ Selectors
34  DF  .~.~.~ With type-wheel recorder
33 MP  DF  .~.~.~ Monopulse
33 A  DF  .~.~.~ Double selectors
35  DF  .~.~ With type-wheel recorder
36  DF  .~.~ Recorders
37  DF  .~.~.~ Privacy (e.g., mechanical packaging or covering of printed message)
38  DF  .~.~.~ With type wheel
39  DF  .~.~.~.~ Multiple
40  DF  .~.~.~.~.~ Shifting devices
41  DF  .~.~.~.~ Unisons
42  DF  .~.~.~ Paper guiding or feeding
23 A  DF  .~.~ Error detection in printers
43  DF  .~ Space induction
45  DF  .~ Loaded circuit
46  DF  .~.~ Loading coils
47  DF  .~ Harmonic or reed
48  DF  .~.~ Recorders and receivers
49  DF  .~ Superposed current
62  DF  .~ Chemical
63 R  DF  .~ Cable or capacity
63 A  DF  .~.~ Cable repeaters
63 B  DF  .~.~ Cable transmitters
63 C  DF  .~.~ Cable receivers
63 D  DF  .~.~ Cable mechanical structure
63 E  DF  .~.~ Distortion correction and artificial lines
63 F  DF  .~.~ Direction reversing
64  DF  .~ Coil transformer
65  DF  .~ Dynamo
66.1  DF  .~ Alternating or pulsating current
116  DF  .~.~ Spark gap or arc discharge
117  DF  .~.~ Coherer
66.2  DF  .~.~ Transmitter keying
67.1  DF  .~.~ Modified semicycle
69 R  DF  .~ Line-clearing and circuit maintenance
69 M  DF  .~.~ Frequency measuring and compensating
69 N  DF  .~.~ Precorrectors
69 A  DF  .~.~ Distortion measuring
69 B  DF  .~.~ Interference neutralizing
69 C  DF  .~.~ Balancing duplex cables
69 D  DF  .~.~ Zero wander neutralizers
69 E  DF  .~.~ Leakage compensation
69 F  DF  .~.~ Neutralizing line capactive discharge
69 G  DF  .~.~ Monitoring, alarm and pilot signals
69 H  DF  .~.~ Reiterative
69 K  DF  .~.~ Misc. gas-filled tube circuits
69 L  DF  .~.~ Check back
69.6  DF  .~ Call
2 A  DF  .~ Simplex-reversing periodic
2 B  DF  .~ Code changers
2 C  DF  .~ Way stations; party lines
2 D  DF  .~ Round robins
2 E  DF  .~ Satellite
2 F  DF  .~ Coin-controlled, connecting, recording
70 R  DF  REPEATERS
71.1  DF  .~ Automatic in either direction
72  DF  .~.~ Mechanical circuit retainer
73  DF  .~.~ Multiple line
71.2  DF  .~.~ Distributor
71.3  DF  .~.~ Mechanical
71.4  DF  .~.~ Generator
71.5  DF  .~.~ Artificial line and relay
71.6  DF  .~.~ Vacuum tube and gas magnetron
71.7  DF  .~.~ Code transformer
71.8  DF  .~.~ Oscillatory
71.9  DF  .~.~ One-way repeater switched
71.11  DF  .~.~ Piezoelectric
71.12  DF  .~.~ Vacuum tube and relay
71.13  DF  .~.~ Relay only
71.14  DF  .~.~ Supervisory, alarm, monitor
70 A  DF  .~ Relays only
70 B  DF  .~ Vibrating relays
70 C  DF  .~ Rotary distributors
70 D  DF  .~ Mechanical
70 E  DF  .~ Tuning forks
70 F  DF  .~ Vacuum tubes
70 G  DF  .~.~ With rotary distributors
70 H  DF  .~ Gas tubes
70 K  DF  .~.~ And distributors
70 M  DF  .~ Magnetic
70 N  DF  .~ Magnetron repeaters
70 P  DF  .~ Photocell
70 Q  DF  .~ Piezoelectric
70 J  DF  .~ Generator
70 S  DF  .~ Having a carrier wave input
70 T  DF  .~ Oscillatory
70 TS  DF  .~ Using transistors
74  DF  CIRCUITS
75  DF  .~ Manipulating switch
76  DF  .~ Retarded closer
77  DF  COMBINED INSTRUMENTS
78  DF  .~ Portable sets
79  DF  CODE TRANSMITTERS
80  DF  .~ Combined instruments
81  DF  .~.~ With typewriter
82 R  DF  .~ Automatic dot
82 B  DF  .~.~ With electromagnet
82 A  DF  .~.~ And dash
83  DF  .~ Rotary contact
84  DF  .~.~ Drum
85  DF  .~ Oscillating contact
86  DF  .~ Reciprocating contact
118  DF  RECEIVERS
89  DF  .~ Code recorders
90  DF  .~.~ Photographic
91  DF  .~.~ Siphon
92  DF  .~.~ Indenting or perforating
93  DF  .~.~ Polarized
94  DF  .~.~ Pyrographic
95  DF  .~.~ Stop mechanisms
96  DF  .~.~ Inking devices
97  DF  .~.~ Double-tape movement
98  DF  .~ Sounders
99.1  DF  .~.~ Private (e.g., acoustically shielded)
100  DF  .~.~ Augmenting
119  DF  .~ Optical member
120  DF  .~ With electron tube or solid-state device
101  DF  KEYS
102  DF  .~ Multiple contact
103  DF  .~ Multiple line
104  DF  .~ Self-closing
105  DF  .~ Reversible
106  DF  .~ Shifting contact point
107  DF  .~ Knife-edge pivot
108  DF  .~ Horizontal swing
109  DF  .~ Spring pivot
110  DF  .~ Finger buttons
111  DF  TAPES
112  DF  .~ Perforated
114  DF  INSTRUMENT TABLES
115  DF  LEARNERS' INSTRUMENTS
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FOREIGN ART COLLECTIONS
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2.0R  DD  SYSTEMS
FOR 100  DF  .~ Writing (178/18)
FOR 101  DF  .~.~ Alternating current (178/19)
FOR 102  DF  .~.~ Variable direct current (178/20)
FOR 103  DF  .~ Stylus and tablet (178/87)