Method for automatically switching telephone system to an...

Details Method for automatically switching telephone system to an... Method for automatically switching telephone system to an...

2006-03-21

2006-03-21

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S373020

Reexamination Certificate

active

07016486

ABSTRACT:
A method of automatically switching in an on-hook state suitable for a telephone system is provided. The method automatically switches a spring circuit from an off-hook state to the on-hook state when the telephone system operates in an abnormal use state for a unreasonably long period of time. Therefore, the telephone system can be switched back to the on-hook state when the mouthpiece is unintentionally off the hook so the missing of the phone call can be effectively avoided.

REFERENCES:
patent: 4922529 (1990-05-01), Kiel
patent: 5592529 (1997-01-01), Linsker
patent: 5606593 (1997-02-01), Smith
patent: 5612977 (1997-03-01), Ogoro
patent: 5923748 (1999-07-01), Hwang
patent: 6744873 (2004-06-01), McCracken et al.

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