US2269403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric unit
Assignee: Brush Development Co
•
Filing: 1940-08-03
•
Granted: 1942-01-06
•
Expires: 1960-08-03
Abstract
No abstract record available.
Inventors
- 👤 Alfred L W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:44
CPC Classifications
H; H04; H04R; H04R17/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1945-01-05 | 1945-07-07 | 1946-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-05 | 1949-07-07 | 1950-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-05 | 1953-07-07 | 1954-01-06 | $7700.00 | Window Closed / Lapsed |