Patent US2669388A successfully refreshed from Google Patents.
Patent US1956360A successfully refreshed from Google Patents.
US1956360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone instrument
Assignee: Associated Electric Laboratories Inc
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Filing: 1931-05-11
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Granted: 1934-04-24
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Expires: 1951-05-11
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Obergfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:50
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/52
Claims Analysis
Total Claims: 0
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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) | 1937-04-23 | 1937-10-23 | 1938-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-04-23 | 1941-10-23 | 1942-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-04-23 | 1945-10-23 | 1946-04-24 | $7700.00 | Window Closed / Lapsed |