Patent US2497666A successfully refreshed from Google Patents.
US2497666A
Expired / Lapsed
US
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Electrode for piezoelectric crystals
Assignee: Brush Development Co
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Filing: 1945-05-04
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Granted: 1950-02-14
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Expires: 1965-05-04
Abstract
No abstract record available.
Inventors
- 👤 Charles K Gravley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:38
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; H10; H10N; H10N30/00; H10N30/80; H10N30/87; H10N30/877; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12889; Y10T428/12986
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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |