US3223892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of parallel connected d.c. sources
Assignee: ABB Inc USA
•
Filing: 1960-07-22
•
Granted: 1965-12-14
•
Expires: 1980-07-22
Abstract
No abstract record available.
Inventors
- 👤 Isadore K Dortort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:11
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1703353A
Cited
US2677092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |