US2576137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical switching system
Assignee: STC PLC
•
Filing: 1945-07-02
•
Granted: 1951-11-27
•
Expires: 1965-07-02
Abstract
No abstract record available.
Inventors
- 👤 John H Newitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:05
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/54; H03D; H03D1/00; H03D1/14; H03D1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2032193A
Cited
US2164939A
Cited
US2153638A
Cited
US2185199A
Cited
US2386892A
Cited
US2324314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |