US2501263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant voltage regulating system
Assignee: Leeds and Northrup Co
•
Filing: 1946-08-29
•
Granted: 1950-03-21
•
Expires: 1966-08-29
Abstract
No abstract record available.
Inventors
- 👤 Robert H Cherry
- 👤 Jr Albert J Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:26
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1094733A
Cited
US1094732A
Cited
US1961746A
Cited
US1847865A
Cited
US2086910A
Cited
US2407458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |