US3428882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shunt-switching voltage regulated power supply
Assignee: 3M Unitek Corp
•
Filing: 1965-08-23
•
Granted: 1969-02-18
•
Expires: 1985-08-23
Abstract
No abstract record available.
Inventors
- 👤 John A Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:35
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06; G05F1/00; G05F1/10; G05F1/12; G05F1/14; G05F1/16; G05F1/20; G05F1/32; G05F1/34; G05F1/38; G05F1/40; G05F1/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3260917A
Cited
US3141124A
Cited
US3246229A
Cited
US3302092A
Cited
US3324378A
Cited
US3312889A
Cited
US3295053A
Cited
US3281638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |