US Patent Class 379
TELEPHONIC COMMUNICATIONS-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
34  DF  SERVICE MONITORING OR OBSERVATION {1}
36  DF  FREE CALLING FROM PAYSTATION
37  DF  EMERGENCY OR ALARM COMMUNICATIONS (E.G., WATCHMAN'S CIRCUIT) {9}
52  DF  INCLUDING AID FOR HANDICAPPED USER (E.G., VISUAL, TACTILE, HEARING AID COUPLING)
55.1  DF  HAVING NEAR FIELD LINK (E.G., CAPACITIVE, INDUCTIVE)
56.1  DF  HAVING LIGHT WAVE OR ULTRASONIC LINK FOR SPEECH OR PAGING SIGNAL {2}
67.1  DF  AUDIO MESSAGE STORAGE, RETRIEVAL, OR SYNTHESIS {13}
90.01  DF  TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) {8}
110.01  DF  COMPOSITE SUBSTATION OR TERMINAL (E.G., HAVING CALCULATOR, RADIO)
111  DF  WITH USAGE MEASUREMENT (E.G., CALL OR TRAFFIC REGISTER) {3}
142  DF  WITH CALLING NUMBER DISPLAY OR RECORDING AT CALLED SUBSTATION
143  DF  WITH CHECK OPERATED CONTROL (E.G., PAYSTATION) {5}
156  DF  MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION {7}
167  DF  PRIVATE (E.G., HOUSE OR INTERCOM) OR SINGLE LINE SYSTEM {6}
177  DF  POLYSTATION LINE SYSTEM (I.E., PARTY LINE) {6}
188  DF  CALL OR TERMINAL ACCESS ALARM OR CONTROL {5}
201  DF  SPECIAL SERVICES {9}
219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
242  DF  CENTRALIZED SWITCHING SYSTEM {15}
333  DF  CONCENTRATOR OR TRUNK SELECTOR {4}
338  DF  REPEATER (E.G., VOICE FREQUENCY) {9}
350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
387  DF  SUBSTATION OR TERMINAL CIRCUITRY {7}
398  DF  LINE EQUALIZATION OR IMPEDANCE MATCHING
399  DF  SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE {5}
414  DF  TRANSMISSION LINE CONDITIONING {2}
418  DF  CALL SIGNAL GENERATING (E.G., RINGING OR TONE GENERATOR)
419  DF  TERMINAL {4}
441  DF  TERMINAL ACCESSORY OR AUXILIARY EQUIPMENT {9}
457  DF  MISCELLANEOUS
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CROSS REFERENCE ART COLLECTIONS
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900  DF  INTERNET (e.g., Internet phone, webphone, Internet-based telephony)
901  DF  VIRTUAL NETWORKS OR VIRTUAL PRIVATE NETWORKS
902  DF  AUTO-SWITCH FOR AN INCOMING VOICE DATA, OR FAX TELEPHONE CALL (E.G., COMP/ FAX/TEL)
903  DF  PASSWORD
904  DF  AUTO-CALLING
905  DF  FAX MAIL
906  DF  TOUCHTONE MESSAGE TRANSMISSION
907  DF  SPEECH RECOGNITION VIA TELEPHONE SYSTEM OR COMPONENT {1}
909  DF  ALTERNATIVES
910  DF  BAR CODE OR OPTICAL CHARACTER READER WITH TELEPHONE
911  DF  DISTINCTIVE RINGING
912  DF  GEOGRAPHICALLY ADAPTIVE
913  DF  PERSON LOCATOR OR PERSON-SPECIFIC
914  DF  PROGRAMMABLE TELEPHONE COMPONENT {1}
916  DF  TOUCH SCREEN ASSOCIATED WITH TELEPHONE SET
917  DF  VOICE MENUS
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FOREIGN ART COLLECTIONS
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FOR 100  DF  HAVING NEAR FIELD LINK (E.G., CAPACITIVE, INDUCTIVE) (379/55)
FOR 101  DF  HAVING ELECTROMAGNETIC LINK FOR SPEECH OR PAGING SIGNAL (E.G., LIGHT WAVE LINK) (379/56) {2}
FOR 109  DF  HAVING SINGLE CHANNEL TELEPHONE CARRIER (379/64) {2}
FOR 112  DF  TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) (379/90) {8}
FOR 132  DF  COMPOSITE SUBSTATION OR TERMINAL (E.G., HAVING CALCULATOR, RADIO) (379/110)
FOR 133  DF  WITH AUDIO MESSAGE STORAGE AND RETRIEVAL (379/67) {1}