Patent US2219729A successfully refreshed from Google Patents.
US2423091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact rectifier
Assignee: STC PLC
•
Filing: 1942-10-03
•
Granted: 1947-07-01
•
Expires: 1962-10-03
Abstract
No abstract record available.
Inventors
- 👤 Fiore William
- 👤 Chester A Kotterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:42
CPC Classifications
H; H10; H10W; H10W90/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US701253A
Cited
US785205A
Cited
US1382440A
Cited
US1585991A
Cited
US1833332A
Cited
US1908800A
Cited
US2042542A
Cited
US2158851A
Cited
US2221616A
Cited
US2254474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |