US3542985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker for high voltage direct current
Assignee: ABB Norden Holding AB
•
Filing: 1968-01-25
•
Granted: 1970-11-24
•
Expires: 1988-01-25
Abstract
No abstract record available.
Inventors
- 👤 Kristian Dahl Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:32
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/14; H01H33/002; H01H33/18; H01H33/60; H01H33/68; H01H33/59; H01H33/596
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1547407A
Cited
DE523890C
Cited
US2150564A
Cited
US2820122A
Cited
US3128361A
Cited
US3014109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |