Method and apparatus for electronic payphone open switch interva

Details Method and apparatus for electronic payphone open switch interva Method and apparatus for electronic payphone open switch interva

1988-06-28

1990-12-18

Schreyer, Stafford D.

Telephonic communications

With check operated control

Fraud or interference prevention

379146, H04M 1702, H04M 1900

Patent

active

049792083

ABSTRACT:
Control apparatus for a line operated telephone is described. This control circuitry is designed to be primarily telephone line powered and to not employ a large capacitor for storing power to sustain the circuitry during open switch intervals in which the telephone line is not powered. Rather, the present circuity includes a telephone line monitoring circuit for sensing a power down condition, a processing means such as a microprocessor with an associated power down program for storing process status at a time just prior to power down and for resetting the processing at the appropriate place upon power up, and low power state monitoring latches for monitoring important events, such as an on hook condition, coin collection and refund operations occurring during an open switch interval. In combination, a low power operation is achieved primarily utilizing a regularly interrupted source, the phone lines, and requiring only small battery to power the low power monitoring state monitoring latches.

REFERENCES:
patent: 3428751 (1969-02-01), Edington
patent: 4031325 (1977-06-01), Dudonis et al.
patent: 4039768 (1977-08-01), O'Maley
patent: 4046962 (1977-09-01), Rogers
patent: 4074079 (1988-02-01), Prell et al.
patent: 4326103 (1982-04-01), Oehrig
patent: 4361731 (1982-11-01), Smoot
patent: 4567325 (1986-01-01), Crouch et al.
patent: 4625078 (1986-11-01), Crouch et al.
patent: 4674114 (1987-06-01), Crouch et al.
patent: 4742536 (1988-05-01), Dewenter et al.
patent: 4768217 (1988-08-01), Asano et al.
patent: 4768223 (1988-08-01), Kinoshita et al.
patent: 4926458 (1990-05-01), Reger et al.

Affiliated with

Also associated with

Rating

Method and apparatus for electronic payphone open switch interva does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for electronic payphone open switch interva, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for electronic payphone open switch interva will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1430560