US2467353A
Expired / Lapsed
US
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Piezoelectric crystal apparatus
Assignee: Individual
•
Filing: 1939-02-16
•
Granted: 1949-04-12
•
Expires: 1959-02-16
Abstract
No abstract record available.
Inventors
- 👤 John M Wolfskill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:34
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02007; H03H9/02062; H03H9/0207; H03H9/05; H03H9/0504; H03H9/15; H03H9/17; H03H9/19; H03H9/46; H03H9/54; H03H9/545
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB279595A
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US2017897A
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US2173589A
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US2218200A
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US2151754A
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GB457342A
Cited
US2128837A
Cited
US2178224A
Cited
US2119848A
Cited
US2159796A
Cited
US2249933A
Cited
US2343059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-11 | 1952-10-11 | 1953-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-11 | 1956-10-11 | 1957-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-11 | 1960-10-11 | 1961-04-12 | $7700.00 | Window Closed / Lapsed |