Patent US3219996A successfully refreshed from Google Patents.
US3219996A
Expired / Lapsed
US
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Transducer systems
Assignee: Electro Mechanical Research Inc
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Filing: 1961-11-21
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Granted: 1965-11-23
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Expires: 1981-11-21
Abstract
No abstract record available.
Inventors
- 👤 Jr George W Masters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:22
CPC Classifications
H; H03; H03M; H03M1/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/0128; G02F1/0131; G02F7/00; H03M1/12; H03M1/22
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |