Patent US1942535A successfully refreshed from Google Patents.
US1942535A
Expired / Lapsed
US
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Voltage regulation system
Assignee: Individual
•
Filing: 1928-04-24
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Granted: 1934-01-09
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Expires: 1948-04-24
Abstract
No abstract record available.
Inventors
- 👤 Cairns Mae Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:18
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06
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) | 1937-01-08 | 1937-07-10 | 1938-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-08 | 1941-07-10 | 1942-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-08 | 1945-07-10 | 1946-01-09 | $7700.00 | Window Closed / Lapsed |