US2961638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetostrictive electro-acoustical transducer
Assignee: Individual
•
Filing: 1955-04-25
•
Granted: 1960-11-22
•
Expires: 1975-04-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Louis R Padberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:36
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/08; B06B1/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2076330A
Cited
GB402830A
Cited
US2249835A
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US2651148A
Cited
US2741754A
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US2724666A
Cited
US2714186A
Cited
US2737639A
Cited
US2847655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |