US2957967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical disconnectors
Assignee: HK Porter Co Inc
•
Filing: 1957-07-15
•
Granted: 1960-10-25
•
Expires: 1977-07-15
Abstract
No abstract record available.
Inventors
- 👤 Fred G Macrae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:31
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1009748A
Cited
US1179722A
Cited
US1266558A
Cited
US2158859A
Cited
US2305436A
Cited
US2551858A
Cited
US2860210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |