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Patent US1901708A successfully refreshed from Google Patents.
US1901708A
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Invar relay
Assignee: Westinghouse Electric Corp
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Filing: 1931-11-11
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Granted: 1933-03-14
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Expires: 1951-11-11
Abstract
No abstract record available.
Inventors
- 👤 William M Ellingson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:22
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-03-13 | 1936-09-12 | 1937-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-13 | 1940-09-12 | 1941-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-13 | 1944-09-12 | 1945-03-14 | $7700.00 | Window Closed / Lapsed |