US3337772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer differential protection
Assignee: ABB Norden Holding AB
•
Filing: 1964-12-14
•
Granted: 1967-08-22
•
Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Andersson Stig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:00
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/04; H02H7/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3144586A
Cited
US3218516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |