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Patent US3291913A successfully refreshed from Google Patents.
US3291913A
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Telephone system signal converter
Assignee: AT&T Inc
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Filing: 1963-05-17
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Granted: 1966-12-13
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Expires: 1983-05-17
Abstract
No abstract record available.
Inventors
- 👤 Edward E Hanna
- 👤 Arthur W Kettley
- 👤 Terrell N Lowry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:40
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A TELEPHONE SWITCHING SYSTEM IN COMBINATION, A PLURALITY OF SIGNAL CONVERTERS FOR CONVERTING MULTIFREQUENCY CALLING SIGNALS TO SERIAL GROUPS OF PULSES, AN ELECTRONIC CONTROL APPARATUS COMMON TO ALL OF SAID CONVERTERS INCLUDING MEANS FOR STORING A PLURALITY OF DIFFERENT PROGRAMS OF ORDERS FOR CONTROLLING THE OPERATION OF SAID ELECTRONIC EQUIPMENT MEANS FOR CONTROLLING THE STORING OF MULTIFREQUENCY SIGNALS RECEIVED BY EACH OF SAID CONVERTERS BY ONE OF SAID PROGRAMS, AND MEANS FOR CONTROLLING THE TRANSMISSION OF CONVERTED SIGNALS BY EACH OF SAID CONVERTERS BY ANOTHER ONE OF SAID PROGRAMS.
Claim 2
Dependent Claim
90 words
IN A TELEPHONE SWITCHING SYSTEM IN COMBINATION, A PLURALITY OF SIGNAL CONVERTERS FOR CONVERTING MULTIFREQUENCY CALLING SIGNALS TO SERIAL GROUPS OF PULSES, AN ELECTRONIC CONTROL APPARATUS COMMON TO ALL OF SAID CONVERTERS INCLUDING MEANS FOR STORING A PLURALITY OF DIFFERENT PROGRAMS OF ORDERS FOR CONTROLLING THE OPERATION OF SAID ELECTRONIC EQUIPMENT MEANS FOR CONTROLLING THE STORING OF MULTIFREQUENCY SIGNALS RECEIVED BY EACH OF SAID CONVERTERS BY ONE OF SAID PROGRAMS, AND MEANS FOR CONTROLLING THE TRANSMISSION OF CONVERTED SIGNALS BY EACH OF SAID CONVERTERS BY ANOTHER ONE OF SAID PROGRAMS.
References Cited (Backward Citations)
US2723312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |