Patent US3486047A successfully refreshed from Google Patents.
US3486047A
Expired / Lapsed
US
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Transducer
Assignee: EIDP Inc
•
Filing: 1967-02-20
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Granted: 1969-12-23
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 John Seymour Seney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:10
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/02; H04R1/00; H04R1/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3283181A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |