US3424871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant-voltage supply for electronic equipment in battery-operated recording or playback apparatus
Assignee: Philips North America LLC
•
Filing: 1965-05-07
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Granted: 1969-01-28
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Expires: 1985-05-07
Abstract
No abstract record available.
Inventors
- 👤 Wolf Dombacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/302; G; G05; G05F; G05F1/00; G05F1/10; G05F1/625; G05F1/63; G05F1/648; G11; G11B; G11B15/00; G11B15/18; G11B19/00; G11B19/20; G11B19/28; G11B5/00; H02; H02P; H02P7/00; H02P7/06; H02P7/063; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; G11B2005/0002; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |