Patent US1560754A successfully refreshed from Google Patents.
Patent US2851536A successfully refreshed from Google Patents.
US2851536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone systems
Assignee: Automatic Telephone and Electric Co Ltd
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Filing: 1955-10-18
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Granted: 1958-09-09
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Expires: 1975-10-18
Abstract
No abstract record available.
Inventors
- 👤 Galvin John Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:44
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/523
Claims Analysis
Total Claims: 0
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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) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |