Patent US3055983A successfully refreshed from Google Patents.
US3055983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone or like systems
Assignee: British Telecommunications PLC
•
Filing: 1957-01-23
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Granted: 1962-09-25
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Expires: 1977-01-23
Abstract
No abstract record available.
Inventors
- 👤 Exeutor Midland Bank
- 👤 Limited Trustee Company
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:26
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2513112A
Cited
US2680155A
Cited
US2764634A
Cited
US2700148A
Cited
US2771595A
Cited
US2721990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |