US3005933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe protective circuit for a magnetic amplifier
Assignee: Vapor Heating Corp
•
Filing: 1957-10-21
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Granted: 1961-10-24
•
Expires: 1977-10-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Christ
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:55
CPC Classifications
H; H03; H03F; H03F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2431151A
Cited
US2680186A
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US2745908A
Cited
US2762967A
Cited
US2767296A
Cited
US2769131A
Cited
US2831160A
Cited
US2895085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-23 | 1965-04-24 | 1965-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-23 | 1969-04-24 | 1969-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-23 | 1973-04-24 | 1973-10-24 | $7700.00 | Window Closed / Lapsed |