US3025419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic frequency generating crystal assembly
Assignee: Individual
•
Filing: 1957-06-18
•
Granted: 1962-03-13
•
Expires: 1977-06-18
Abstract
No abstract record available.
Inventors
- 👤 Hal C Mettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2283285A
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US2431233A
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US2494433A
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US2460153A
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US2587304A
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US2666862A
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US2803129A
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US2788454A
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US2875354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |