Patent US2274754A successfully refreshed from Google Patents.
Patent US2409893A successfully refreshed from Google Patents.
US2409893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconducting composition
Assignee: Westinghouse Electric Corp
•
Filing: 1945-04-30
•
Granted: 1946-10-22
•
Expires: 1965-04-30
Abstract
No abstract record available.
Inventors
- 👤 Wesley W Pendleton
- 👤 Leslie E Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:34
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2475
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) | 1949-10-21 | 1950-04-22 | 1950-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-10-21 | 1954-04-22 | 1954-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-10-21 | 1958-04-22 | 1958-10-22 | $7700.00 | Window Closed / Lapsed |