US1994487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of applying electrodes to piezo crystals
Assignee: Brush Development Co
•
Filing: 1930-01-24
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Granted: 1935-03-19
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Expires: 1950-01-24
Abstract
No abstract record available.
Inventors
- 👤 Charles B Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:35
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; H10; H10N; H10N30/00; H10N30/01; H10N30/06; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-03-18 | 1938-09-17 | 1939-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-18 | 1942-09-17 | 1943-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-18 | 1946-09-17 | 1947-03-19 | $7700.00 | Window Closed / Lapsed |