US2838729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulating device
Assignee: US Philips Corp
•
Filing: 1953-11-23
•
Granted: 1958-06-10
•
Expires: 1973-11-23
Abstract
No abstract record available.
Inventors
- 👤 Lovell Peter Gareth
- 👤 Stephens Robert Bryce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:20
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE160070C
Cited
US2207234A
Cited
US2195120A
Cited
US2212198A
Cited
US2435572A
Cited
US2580020A
Cited
US2512317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |