US2567484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intercommunication telephone system
Assignee: MODERN TELEPHONE Corp
•
Filing: 1949-10-19
•
Granted: 1951-09-11
•
Expires: 1969-10-19
Abstract
No abstract record available.
Inventors
- 👤 Ivens Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:55
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2166517A
Cited
US2162370A
Cited
US2162369A
Cited
US2255517A
Cited
US2249456A
Cited
US2269144A
Cited
US2347079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |