US Patent Class 370
MULTIPLEX COMMUNICATIONS-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
200  DF  PHANTOM
201  DF  CROSSTALK SUPPRESSION
202  DF  AMPLITUDE COMPRESSION OR EXPANSION
203  DF  GENERALIZED ORTHOGONAL OR SPECIAL MATHEMATICAL TECHNIQUES {5}
212  DF  PULSE WIDTH (PULSE DURATION) MODULATION
213  DF  PULSE POSITION MODULATION
214  DF  SIMULTANEOUS TELEGRAPHY AND TELEPHONY
215  DF  PHASE MODULATION
216  DF  FAULT RECOVERY {3}
229  DF  DATA FLOW CONGESTION PREVENTION OR CONTROL {3}
241  DF  DIAGNOSTIC TESTING (OTHER THAN SYNCHRONIZATION) {6}
254  DF  NETWORK CONFIGURATION DETERMINATION {2}
259  DF  SPECIAL SERVICES {3}
272  DF  SEXTUPLEX
273  DF  QUADRUPLEX {2}
276  DF  DUPLEX {6}
297  DF  DIPLEX
298  DF  LOW SPEED ASYNCHRONOUS DATA SYSTEM (E.G., TELETYPEWRITER SERVICE) {5}
307  DF  TRASMULTIPLEXERS
308  DF  RESONANT TRANSFER TECHNIQUES
309  DF  RESONANT TRANSFER SUBSTITUTES
310  DF  COMMUNICATION OVER FREE SPACE {10}
351  DF  PATHFINDING OR ROUTING {5}
431  DF  CHANNEL ASSIGNMENT TECHNIQUES {12}
464  DF  COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9}
546  DF  MISCELLANEOUS
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CROSS-REFERENCE ART COLLECTIONS
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901  DF  WIDE AREA NETWORK {1}
908  DF  LOCAL AREA NETWORK {3}
912  DF  PACKET COMMUNICATIONS {1}
914  DF  RATE CONVERTER
915  DF  TIME DIVISION CELLULAR RADIO SYSTEMS
916  DF  MULTIPLEXER/DEMULTIPLEXER
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FOREIGN ART COLLECTIONS
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FOR 100  DF  SIMULTANEOUS TELEGRAPHY AND TELEPHONY (370/125)
FOR 101  DF  MULTIPLEX SWITCHING (370/53) {5}
FOR 122  DF  FREQUENCY DIVISION (370/69.1) {10}
FOR 135  DF  TIME DIVISION (370/77) {14}
FOR 195  DF  TRANSMISSION BANDWIDTH CONSERVATION (370/118)
FOR 196  DF  MISCELLANEOUS (370/119)