US3718771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone calling apparatus utilizing digital logic devices
Assignee: NAT MIDCO IND
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Filing: 1970-07-07
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Granted: 1973-02-27
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Expires: 1990-07-07
Abstract
Abstract An automatic telephone calling apparatus is disclosed in which a first counter counts dial pulses and a second counter counts the digits of a telephone number. A cross-wiring field permits the detection of coincidence between one of the outputs of each counter and one of the outputs of the other counter. When a coincidence is detected, the dial pulse counter is stopped at the desired number of dial pulses. An interdigital timer is then activated to time out a preselected interdigital interval. Thereafter, the dial pulse counter again begins to count dial pulses and again terminates when the particular count cross wired in the cross-wiring field is reached.
Inventors
- 👤 G Bank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:33
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/274; H04M1/2745; H04M1/27495
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
An automatic telephone calling circuit comprising: a dial pulse counter for normally counting dial pulses responsive to an interdigit signal for not counting said dial pulses; a digit counter for counting occurences of said interdigit signal; an interdigit counter responsive to said interdigit signal for counting said dial pulses; a coincidence detector for detecting the coincidence of preselected counts from said dial pulse counter and said digit counter to provide said interdigit signal; and means responsive to said interdigit counter reaching a predetermined count for terminating said interdigit signal.
Claim 2
Dependent Claim
89 words
An automatic telephone calling circuit comprising: a dial pulse counter for normally counting dial pulses responsive to an interdigit signal for not counting said dial pulses; a digit counter for counting occurences of said interdigit signal; an interdigit counter responsive to said interdigit signal for counting said dial pulses; a coincidence detector for detecting the coincidence of preselected counts from said dial pulse counter and said digit counter to provide said interdigit signal; and means responsive to said interdigit counter reaching a predetermined count for terminating said interdigit signal.
Claim 3
Dependent Claim
97 words
The automatic telephone calling circuit as defined in claim 1 in which said dial pulse counter and said digit counter each include: a ring counter having an input and an output, said ring counter including a plurality of stages each of said stages having an input and an output; means for connecting the output of said ring counter inversely to said input of said ring counter; means for advancing said ring counter; a plurality of two input AND gates; and means for connecting said output of selected pairs of said stages to each of said AND gates.
Claim 4
Dependent Claim
41 words
The automatic telephone calling circuit as defined in claim 1 further including a binary decoding circuit comprising a plurality of two-input And gates, and means for connecting said outputs of selected pairs of said stages to each of said And gates.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |