Patent US6223074B1 successfully refreshed from Google Patents.
US3474403A
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US
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Electroacoustic transducer with improved shock resistance
Assignee: MASSA DONALD P COHASSET
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Filing: 1966-06-08
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Granted: 1969-10-21
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Expires: 1986-06-08
Abstract
No abstract record available.
Inventors
- 👤 Frank Massa
- 👤 Gilbert C Barrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:30
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2405604A
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US2640165A
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US3082334A
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US3199071A
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US3281770A
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US3284761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |