Patent US3394698A successfully refreshed from Google Patents.
US3394698A
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US
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Ear noise suppressor and speech clarifier
Assignee: HUSH NOISE CORP
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Filing: 1964-09-29
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Granted: 1968-07-30
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Expires: 1984-09-29
Abstract
No abstract record available.
Inventors
- 👤 Gilbert R Calkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/08; A61F11/30
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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |