US2929883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field telephone hand set
Assignee: National Pneumatic Co Inc
•
Filing: 1954-05-28
•
Granted: 1960-03-22
•
Expires: 1974-05-28
Abstract
No abstract record available.
Inventors
- 👤 Durbin Vernon
- 👤 Ernest W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:28
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/18; G; G10; G10K; G10K1/00; G10K1/06; G10K1/062
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1526494A
Cited
US1930270A
Cited
US2183744A
Cited
US2223144A
Cited
US2252751A
Cited
US2308550A
Cited
US2332448A
Cited
US2298207A
Cited
US2338757A
Cited
US2439408A
Cited
US2385339A
Cited
US2377162A
Cited
US2420638A
Cited
US2485615A
Cited
US2468474A
Cited
US2578367A
Cited
US2686835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |