Patent US2689186A successfully refreshed from Google Patents.
Patent US1590420A successfully refreshed from Google Patents.
US1590420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comparator
Assignee: Westinghouse Electric Corp
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Filing: 1921-01-14
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Granted: 1926-06-29
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Expires: 1941-01-14
Abstract
No abstract record available.
Inventors
- 👤 Lewis W Chubb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:33
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/10; G01R17/105
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) | 1929-06-28 | 1929-12-28 | 1930-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-06-28 | 1933-12-28 | 1934-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-06-28 | 1937-12-28 | 1938-06-29 | $7700.00 | Window Closed / Lapsed |