Patent US3562811A successfully refreshed from Google Patents.
US3562811A
Expired / Lapsed
US
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Suspension for ear enclosure inside a protective helmet
Assignee: RTX BBN Technologies Corp
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Filing: 1969-05-21
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Granted: 1971-02-16
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Expires: 1989-05-21
Abstract
Abstract THIS DISCLOSURE DEALS WITH NOVEL SUSPENSIONS WITHIN PROTECTIVE HELMETS AND THE LIKE FOR DETACHABLY-SUPPORTING EAR ENCLOSURES SUCH AS EAR MUFFS, EARPHONES, AND THE LIKE, SAID SUSPENSION INCLUDING A STRAP OVERLYING A SPRING AND HAVING COOPERATIVE FASTENING MEANS FOR A DETACHABLE EAR ENCLOSURE.
Inventors
- 👤 Clayton H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:00
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)
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |