US3433462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for resonating small piezoelectric crystals at low frequencies
Assignee: Crest Ultrasonics Corp
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Filing: 1968-01-19
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Granted: 1969-03-18
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Edward G Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:50
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0269; B06B1/0276; B06B1/06; B06B1/0644; B06B1/0648; B06B2201/00; B06B2201/20; B06B2201/70; B06B2201/71
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) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |