US3538418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching-mode voltage and current regulator
Assignee: Instrumentation Specialties Co
•
Filing: 1968-10-29
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Granted: 1970-11-03
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Expires: 1988-10-29
Abstract
No abstract record available.
Inventors
- 👤 Robert W Allington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:15
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; G05F1/45; G05F1/455
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3114873A
Cited
US3213351A
Cited
US3289069A
Cited
US3375428A
Cited
US3356927A
Cited
US3372326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |