US2497665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric device
Assignee: Brush Development Co
•
Filing: 1945-02-07
•
Granted: 1950-02-14
•
Expires: 1965-02-07
Abstract
No abstract record available.
Inventors
- 👤 Charles K Gravley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1572352A
Cited
US2282317A
Cited
US2393429A
Cited
GB575068A
Cited
US2388242A
Cited
US2423922A
Cited
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 |