Patent US2005041A successfully refreshed from Google Patents.
Patent US2770762A successfully refreshed from Google Patents.
US2770762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal triodes
Assignee: International Standard Electric Corp
•
Filing: 1950-03-28
•
Granted: 1956-11-13
•
Expires: 1970-03-28
Abstract
No abstract record available.
Inventors
- 👤 White Charles De Boismaison
- 👤 Matthews Kenneth Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:56
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/14; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2524034A
Cited
US2524035A
Cited
US2476323A
Cited
US2560579A
Cited
US2502479A
Cited
US2600500A
Cited
US2553490A
Cited
US2609428A
Cited
US2586080A
Cited
US2597028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |