US2868922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum switch
Assignee: PENTA LAB Inc
•
Filing: 1957-01-14
•
Granted: 1959-01-13
•
Expires: 1977-01-14
Abstract
No abstract record available.
Inventors
- 👤 Radford P Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:21
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US946215A
Cited
US1175323A
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US2001579A
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US2029267A
Cited
US2131942A
Cited
US2156974A
Cited
US2170961A
Cited
US2360941A
Cited
US2485024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |