US3487292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for the control of silicon controlled rectifiers
Assignee: INVALCO Inc
•
Filing: 1964-08-12
•
Granted: 1969-12-30
•
Expires: 1984-08-12
Abstract
No abstract record available.
Inventors
- 👤 Owen D Tibbetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:51
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3226627A
Cited
US3146392A
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US3213351A
Cited
US3177418A
Cited
US3316477A
Cited
US3299341A
Cited
US3304487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |