US2904645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helmet radios including a transistor amplifier
Assignee: Individual
•
Filing: 1956-09-17
•
Granted: 1959-09-15
•
Expires: 1976-09-17
Abstract
No abstract record available.
Inventors
- 👤 George A Sarles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:08
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/30; H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/273; H01Q1/276; H04; H04B; H04B1/00; H04B1/38; H04B1/3827; H04B1/385; H04B2001/3866
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |