US2421645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulating system
Assignee: Metropolitan Vickers Electrical Co Ltd
•
Filing: 1945-05-29
•
Granted: 1947-06-03
•
Expires: 1965-05-29
Abstract
No abstract record available.
Inventors
- 👤 Partington Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:25
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790691A
Cited
US1876548A
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US1837738A
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US1865595A
Cited
US1993914A
Cited
GB439955A
Cited
GB441192A
Cited
US2139330A
Cited
US2155515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |