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Patent US2977426A successfully refreshed from Google Patents.
US2977426A
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Ear pad
Assignee: Day International Corp
•
Filing: 1956-06-25
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Granted: 1961-03-28
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Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 Noyes Howard
- 👤 Edward W Moorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:46
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/10; H04R1/1008; H04R1/1058
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2353070A
Cited
US2474386A
Cited
US2407731A
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US2468721A
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US2529562A
Cited
US2501830A
Cited
US2802214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |