Patent US2836738A successfully refreshed from Google Patents.
US2836738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed piezo crystal
Assignee: Individual
•
Filing: 1956-05-02
•
Granted: 1958-05-27
•
Expires: 1976-05-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Crownover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
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)
US1525823A
Cited
US2195417A
Cited
US2182340A
Cited
US2386279A
Cited
US2403692A
Cited
US2477596A
Cited
US2487962A
Cited
US2607858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |