US2974665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas mask speech transmission
Assignee: Individual
•
Filing: 1954-02-12
•
Granted: 1961-03-14
•
Expires: 1974-02-12
Abstract
No abstract record available.
Inventors
- 👤 Armard V Motsinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:29
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1757459A
Cited
US1991002A
Cited
US2038267A
Cited
GB464458A
Cited
FR826056A
Cited
FR833096A
Cited
US2410454A
Cited
US2325688A
Cited
GB572888A
Cited
US2645301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |