US2539749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open type valve arrester
Assignee: McGraw Electric Co
•
Filing: 1946-11-27
•
Granted: 1951-01-30
•
Expires: 1966-11-27
Abstract
No abstract record available.
Inventors
- 👤 Rolland D Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:59
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/10; H01T4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1822742A
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US1935810A
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US1939679A
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US2018672A
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US2164720A
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US2170337A
Cited
US2272370A
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US2415945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |