Patent US2991429A successfully refreshed from Google Patents.
Patent US3476951A successfully refreshed from Google Patents.
US3476951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrielectric devices
Assignee: Individual
•
Filing: 1962-11-21
•
Granted: 1969-11-04
•
Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 Charles F Pulvari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:09
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; H01G7/026; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/475; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2691738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |