Patent US3359551A successfully refreshed from Google Patents.
US3146314A
Expired / Lapsed
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Means for generating warbling tone ringing signals in a time division multiplex communication system
Assignee: General Dynamics Corp
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Filing: 1961-09-25
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Granted: 1964-08-25
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 Michael A Boehly
- 👤 Pitlik Hillel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:32
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN COMBINATION, FIRST AND SECOND NORMALLY CLOSED BRIDGE GATES, A COMMON HIGHWAY INTERCONNECTING SAID FIRST AND SECOND BRIDGE GATES, MEANS FOR PERIODICALLY OPENING SAID FIRST AND SECOND BRIDGE GATES IN SYNCHRONISM AT A FIRST GIVEN FREQUENCY, A RING TONE GENERATOR PRODUCING A RING TONE AUDIBLE SIGNAL FREQUENCY WHICH DIFFERES FROM ONE-HALF OF SAID FIRST FREQUENCY BY ONE-HALF A SUB-AUDIBLE FREQUENCY, MEANS FOR APPLYING SAID RING TONE AUDIBLE SIGNAL FREQUENCY AS AN INPUT SIGNAL TO SAID FIRST BRIDGE GATE,
Claim 2
Dependent Claim
78 words
IN COMBINATION, FIRST AND SECOND NORMALLY CLOSED BRIDGE GATES, A COMMON HIGHWAY INTERCONNECTING SAID FIRST AND SECOND BRIDGE GATES, MEANS FOR PERIODICALLY OPENING SAID FIRST AND SECOND BRIDGE GATES IN SYNCHRONISM AT A FIRST GIVEN FREQUENCY, A RING TONE GENERATOR PRODUCING A RING TONE AUDIBLE SIGNAL FREQUENCY WHICH DIFFERES FROM ONE-HALF OF SAID FIRST FREQUENCY BY ONE-HALF A SUB-AUDIBLE FREQUENCY, MEANS FOR APPLYING SAID RING TONE AUDIBLE SIGNAL FREQUENCY AS AN INPUT SIGNAL TO SAID FIRST BRIDGE GATE,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |