Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent
1989-06-20
1991-04-16
Bartuska, F. J.
Check-actuated control mechanisms
Including means to test validity of check
By testing material composition
324225, G07D 508
Patent
active
050075209
ABSTRACT:
A microprocessor-controlled electronic coin chute is designed for use in a coin telephone station and adapted to operate over an extended temperature range while making coin acceptance/rejection decisions that are both rapid and accurate. Within the coin chute are a pair of coin quality sensors designed to measure a different property of a coin such as composition and size. Each coin quality sensor comprises a series-connected pair of coils placed on opposite sides of the coin path. These coils are part of an oscillator circuit having a maximum frequency when the coin is positioned between them, and an idle frequency otherwise. Idle frequency measurements are made each time an associated telephone switchhook is operated. The measured idle frequency serves as a temperature indication which, together with a stored program, is used by the microprocessor to establish acceptability limits for each coin in an allowed set. The stored program includes a predetermined functional relationship between acceptability limits and idle frequency for each allowable coin. New acceptability limits are calculated immediately after the idle frequencies are measured.
REFERENCES:
patent: 3870137 (1975-03-01), Fougere
patent: 3918564 (1975-11-01), Heiman et al.
patent: 3918565 (1975-11-01), Fougere et al.
patent: 4041243 (1977-08-01), Zarouni
patent: 4509633 (1985-04-01), Chow
patent: 4534459 (1985-08-01), Picsko
patent: 4538719 (1985-09-01), Gray et al.
patent: 4582189 (1986-04-01), Schmitt
patent: 4601380 (1986-07-01), Dean et al.
patent: 4625078 (1986-11-01), Crouch et al.
patent: 4749074 (1988-06-01), Ueki et al.
patent: 4837511 (1989-06-01), Whittington et al.
patent: 4838405 (1989-06-01), Kimoto
Harris Dawn E.
Orr William H.
AT&T Bell Laboratories
Bartuska F. J.
Morra Michael A.
LandOfFree
Microprocessor-controlled apparatus adaptable to environmental c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microprocessor-controlled apparatus adaptable to environmental c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microprocessor-controlled apparatus adaptable to environmental c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-415232