US3423759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective and sound attenuation helmet
Assignee: United States Department of the Navy
•
Filing: 1966-11-25
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Granted: 1969-01-28
•
Expires: 1986-11-25
Abstract
No abstract record available.
Inventors
- 👤 Frank A Catroppa
- 👤 Sidney Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:32
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/16; A42B3/166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1354524A
Cited
US2286843A
Cited
US2902692A
Cited
US3005203A
Cited
FR1259571A
Cited
US3262125A
Cited
US3335720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |