US3187107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voice-frequency key-dialing subscriber's station
Assignee: International Standard Electric Corp
•
Filing: 1961-03-03
•
Granted: 1965-06-01
•
Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
- 👤 Knight Ronald George
- 👤 Beadle Anthony Crisp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:56
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A VOICE-FREQUENCY KEY-DIALING SUBSCRIBER''S STATION FOR MULTI-STATION TELEPHONE LINES, A PLURALITY OF GENERATOR MEANS, EACH GENERATING A GROUP OF STEADY STATE, SEPARATE VOICE-FREQUENCY SIGNALS, A PLURALITY OF DIGIT-SELECTION KEYS CORRESPONDING RESPECTIVELY TO THE DIGIT VALUES OF ANY DIGIT OF A TELEPHONE NUMBER, MEANS CONTROLLED BY THE OPERATION OF ANY OF SAID KEYS FOR TRANSMITTING A UNIQUE COMBINATION OF VOICE-FREQUENCY SIGNALS CHARACTERISTIC OF THE DIGIT KEY OPERATED, AND SELECTIVELY OPERABLE RESTRICTING MEANS ASSOCIATED WITH A PREDETERMINED ONE OF SAID KEYS FOR ALTERING THE SAID UNIQUE COMBINATION OF VOICE-FREQUENCY SIGNALS TRANSMITTED THEREBY TO A DIFFERENT COMBINATION OF VOICE-FREQUENCY SIGNALS.
Claim 2
Dependent Claim
98 words
IN A VOICE-FREQUENCY KEY-DIALING SUBSCRIBER''S STATION FOR MULTI-STATION TELEPHONE LINES, A PLURALITY OF GENERATOR MEANS, EACH GENERATING A GROUP OF STEADY STATE, SEPARATE VOICE-FREQUENCY SIGNALS, A PLURALITY OF DIGIT-SELECTION KEYS CORRESPONDING RESPECTIVELY TO THE DIGIT VALUES OF ANY DIGIT OF A TELEPHONE NUMBER, MEANS CONTROLLED BY THE OPERATION OF ANY OF SAID KEYS FOR TRANSMITTING A UNIQUE COMBINATION OF VOICE-FREQUENCY SIGNALS CHARACTERISTIC OF THE DIGIT KEY OPERATED, AND SELECTIVELY OPERABLE RESTRICTING MEANS ASSOCIATED WITH A PREDETERMINED ONE OF SAID KEYS FOR ALTERING THE SAID UNIQUE COMBINATION OF VOICE-FREQUENCY SIGNALS TRANSMITTED THEREBY TO A DIFFERENT COMBINATION OF VOICE-FREQUENCY SIGNALS.
References Cited (Backward Citations)
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US3100245A
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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) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |