Patent US3487261A successfully refreshed from Google Patents.
US3487261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor circuit with over-voltage protection
Assignee: ABB Norden Holding AB
•
Filing: 1968-01-02
•
Granted: 1969-12-30
•
Expires: 1988-01-02
Abstract
No abstract record available.
Inventors
- 👤 Ingvar Boksjo
- 👤 Karl-Erik Olsson
- 👤 Per Svedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:46
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/125; H02H; H02H3/00; H02H3/20; H02H3/205
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-12-29 | 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 |