Patent US3328538A successfully refreshed from Google Patents.
US3328538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operator service indicator and check circuit
Assignee: AT&T Inc
•
Filing: 1964-02-24
•
Granted: 1967-06-27
•
Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 Charles E Germanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:52
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/36; H04M3/42; H04M3/50; H04M3/51
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN COMBINATION, CONTROL MEANS OPERABLE FOR CONTROLLING THE INTERCONNECTION OF CALLING CIRCUITS WITH OPERATOR POSITIONS, MEANS FOR GENERATING A TIMED INTERVAL, MEANS REPONSIVE TO EACH OPERATION OF SAID CONTROL MEANS FOR MEASURING THE SPEED WITH WHICH CALLING CIRCUITS ARE INTERCONNECTED WITH OPERATOR POSITIONS WITHIN SAID INTERVAL, AND MEANS ACTIVATED BY SAID MEASURING MEANS FOR SUPPLYING A DISTICT SIGNAL CORRESPONDING TO THE MEASURED SPEED.
Claim 2
Dependent Claim
63 words
IN COMBINATION, CONTROL MEANS OPERABLE FOR CONTROLLING THE INTERCONNECTION OF CALLING CIRCUITS WITH OPERATOR POSITIONS, MEANS FOR GENERATING A TIMED INTERVAL, MEANS REPONSIVE TO EACH OPERATION OF SAID CONTROL MEANS FOR MEASURING THE SPEED WITH WHICH CALLING CIRCUITS ARE INTERCONNECTED WITH OPERATOR POSITIONS WITHIN SAID INTERVAL, AND MEANS ACTIVATED BY SAID MEASURING MEANS FOR SUPPLYING A DISTICT SIGNAL CORRESPONDING TO THE MEASURED SPEED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |