using combinations of frequencies

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CPC
H04Q5/12

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Parent Industries

HELECTRICITY H04Electric communication H04QSELECTING H04Q5/00Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

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H04Q5/12using combinations of frequencies

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Patents Grantslast 30 patents

Information Patent Grant
Telephone answering system and apparatus for direct caller selectio...
- Patent number 5,247,570
- Issue date Sep 21, 1993
- Product Engineering & Manufacturing, Inc.
- James H. Bowen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone answering system and apparatus for direct caller selectio...
- Patent number 5,086,458
- Issue date Feb 4, 1992
- Product Engineering & Manufacturing, Inc.
- James H. Bowen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents