Telephone line exclusion device

Details Telephone line exclusion device Telephone line exclusion device

1987-04-22

1989-02-28

George, Keith E.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 93, 379184, H04M 1100, H04M 168

Patent

active

048093173

ABSTRACT:
A device is disclosed for use on a telephone line where there is two or more telephones or other instruments connected in parallel to the same telephone line whereby when one of the instruments goes off-hook (in a telephone, raises the receiver) the telephone line exclusion device automatically locks out all other instruments connected in parallel with the instrument that went off-hook. Such a result is achieved by a pair of interconnected two-coil polarized normally closed reed relays which interface the incoming telephone line and the two instruments. The two lines which normally connect to each instrument on the telephone line utilizes the normally closed contacts of one relay to energize the coils of the other relay and thereby inhibit the other instrument on the telephone line by opening the normally closed contact of the second relay which is in line with the other instrument. Upon the first instrument going on-hook (in a telephone, returning the receiver to the cradle), the telephone line exclusion device returns to its quiescent state where either instrument upon the line may be utilized.

REFERENCES:
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patent: 4000375 (1976-12-01), Kawamura
patent: 4306116 (1981-12-01), McClure et al.
patent: 4367374 (1983-01-01), Serrano
patent: 4378470 (1983-03-01), Murto et al.
patent: 4394540 (1983-07-01), Willis et al.
patent: 4444999 (1984-04-01), Sparrevohn
patent: 4469917 (1984-09-01), Shelley
patent: 4591662 (1986-05-01), Legros et al.
patent: 4596021 (1986-06-01), Carter et al.
patent: 4604499 (1986-08-01), Hughes
patent: 4640988 (1987-02-01), Robinton
patent: 4660218 (1987-04-01), Hashimoto

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