US2618772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase constant frequency electronic power supply
Assignee: Sorensen & Co Inc
•
Filing: 1949-01-19
•
Granted: 1952-11-18
•
Expires: 1969-01-19
Abstract
No abstract record available.
Inventors
- 👤 Adolph C Bunblasky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:09
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1246617A
Cited
US1835156A
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US1712719A
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US1744711A
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US1921704A
Cited
US1955133A
Cited
US2053426A
Cited
US2333593A
Cited
US2557901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |