Patent US2949544A successfully refreshed from Google Patents.
US2949544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1957-10-04
•
Granted: 1960-08-16
•
Expires: 1977-10-04
Abstract
No abstract record available.
Inventors
- 👤 Earl R Hill
- 👤 Robert L Jun Klar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/70; H02; H02M; H02M3/00; H02M3/02; H02M3/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2737601A
Cited
US2777956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |