Patent US3201521A successfully refreshed from Google Patents.
US3201521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system permanent signal trunk
Assignee: AT&T Inc
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Filing: 1961-12-26
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Granted: 1965-08-17
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Mayer
- 👤 Theodore D Robb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:52
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A PERMANENT SIGNAL TRUNK COMPRISING AN ANNOUNCEMENT MACHINE, MEANS CONTROLLED BY SAID ANNOUNCEMENT MACHINE FOR PROVIDING FIRST TYPE PULSES, EACH OCCURRING BETWEEN TWO SUCCESSIVE ANNOUNCEMENTS, AND SECOND TYPE PULSES OCCURRING AT A SLOWER RATE THAN SAID FIRST TYPE PULSES, RELAY MEANS OPERATIVE IN RESPONSE TO THE CONNECTION THERETO OF A SUBSCRIBER LINE, MEANS RESPONSIVE TO THE FIRST PULSE OF SAID FIRST TYPE OCCURRING AFTER THE OPERATION OF SAID RELAY MEANS FOR CONNECTING SAID ANNOUNCEMENT MACHINE TO SAID SUBSCRIBER LINE, A TONE GENERATOR, MEANS RESPONSE TO THE SECOND PULSE OF SAID FIRST TYPE OCCURRING AFTER THE OPERATION OF SAID MEANS FOR DISCONNECTING SAID ANNOUNCEMENT MACHINE FROM SAID SUBSCRIBER LINE AND FOR CONNECTING SAID TONE GENERATOR TO SAID SUBSCRIBER LINE, AN OPERATOR''S POSITION, AND MEANS RESPONSIVE TO THE OCCURRENCE OF TWO SUCCESSIVE PULSES OF SAID SECOND TYPE AFTER THE OPERATION OF SAID RELAY MEANS FOR DISCONNECTING SAID TONE GENERATOR FROM SAID SUBSCRIBER LINE AND FOR CONNECTING SAID SUBSCRIBER LINE TO SAID OPERATOR''S POSITION.
Claim 2
Dependent Claim
161 words
A PERMANENT SIGNAL TRUNK COMPRISING AN ANNOUNCEMENT MACHINE, MEANS CONTROLLED BY SAID ANNOUNCEMENT MACHINE FOR PROVIDING FIRST TYPE PULSES, EACH OCCURRING BETWEEN TWO SUCCESSIVE ANNOUNCEMENTS, AND SECOND TYPE PULSES OCCURRING AT A SLOWER RATE THAN SAID FIRST TYPE PULSES, RELAY MEANS OPERATIVE IN RESPONSE TO THE CONNECTION THERETO OF A SUBSCRIBER LINE, MEANS RESPONSIVE TO THE FIRST PULSE OF SAID FIRST TYPE OCCURRING AFTER THE OPERATION OF SAID RELAY MEANS FOR CONNECTING SAID ANNOUNCEMENT MACHINE TO SAID SUBSCRIBER LINE, A TONE GENERATOR, MEANS RESPONSE TO THE SECOND PULSE OF SAID FIRST TYPE OCCURRING AFTER THE OPERATION OF SAID MEANS FOR DISCONNECTING SAID ANNOUNCEMENT MACHINE FROM SAID SUBSCRIBER LINE AND FOR CONNECTING SAID TONE GENERATOR TO SAID SUBSCRIBER LINE, AN OPERATOR''S POSITION, AND MEANS RESPONSIVE TO THE OCCURRENCE OF TWO SUCCESSIVE PULSES OF SAID SECOND TYPE AFTER THE OPERATION OF SAID RELAY MEANS FOR DISCONNECTING SAID TONE GENERATOR FROM SAID SUBSCRIBER LINE AND FOR CONNECTING SAID SUBSCRIBER LINE TO SAID OPERATOR''S POSITION.
References Cited (Backward Citations)
US2764636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |