US2802955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric unit
Assignee: Individual
•
Filing: 1953-05-04
•
Granted: 1957-08-13
•
Expires: 1973-05-04
Abstract
No abstract record available.
Inventors
- 👤 Donald M Kitterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:32
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/0504
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2161980A
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US2232277A
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US2399919A
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US2423081A
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US2434266A
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US2575819A
Cited
US2505121A
Cited
US2677775A
Cited
US2706326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |