US2635199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric crystal apparatus
Assignee: Individual
•
Filing: 1948-01-08
•
Granted: 1953-04-14
•
Expires: 1968-01-08
Abstract
No abstract record available.
Inventors
- 👤 John M Wolfskill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:40
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/0504; H03H9/0528; H03H9/125; H03H9/13; H03H9/132; H03H9/46; H03H9/54; H03H9/56; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2385896A
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US2258967A
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US2284753A
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US2343059A
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GB554789A
Cited
US2321358A
Cited
US2315392A
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US2392429A
Cited
US2453435A
Cited
US2482661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |