US2591918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage-regulated electrical power supply
Assignee: Philips Laboratories Inc
•
Filing: 1949-10-15
•
Granted: 1952-04-08
•
Expires: 1969-10-15
Abstract
No abstract record available.
Inventors
- 👤 Byron M Cole
- 👤 Kerkhof Frederik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2272794A
Cited
US2306888A
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US2302900A
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US2373165A
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US2419527A
Cited
US2397150A
Cited
US2426996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |