US2721969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line voltage regulator
Assignee: McGraw Electric Co
•
Filing: 1950-09-11
•
Granted: 1955-10-25
•
Expires: 1970-09-11
Abstract
No abstract record available.
Inventors
- 👤 Anthony Van Ryan
- 👤 William R Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:11
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/14; G05F1/147
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE311247C
Cited
US1897490A
Cited
US2009383A
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US2239768A
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US2374593A
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US2324822A
Cited
US2453451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |