US2764632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intercommunication telephone systems
Assignee: Modern Telephones Great Britain Ltd
•
Filing: 1952-10-09
•
Granted: 1956-09-25
•
Expires: 1972-10-09
Abstract
No abstract record available.
Inventors
- 👤 Adler Adolf Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:55
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/02; H04M11/022
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1272641A
Cited
US1586554A
Cited
US1938709A
Cited
US2226891A
Cited
US2366552A
Cited
US2496629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |