US3408658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing protector
Assignee: American Optical Corp
•
Filing: 1966-08-25
•
Granted: 1968-11-05
•
Expires: 1986-08-25
Abstract
No abstract record available.
Inventors
- 👤 Fred P Beguin
- 👤 Francis T Ashe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:03
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2184996A
Cited
US2801423A
Cited
US3122613A
Cited
US3085253A
Cited
US3051961A
Cited
US3117575A
Cited
US3112493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |