Patent US3841225A successfully refreshed from Google Patents.
Patent US3396338A successfully refreshed from Google Patents.
US3396338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument-type transformers for unidirectional current circuits
Assignee: Cooper Industries LLC
•
Filing: 1967-10-02
•
Granted: 1968-08-06
•
Expires: 1987-10-02
Abstract
No abstract record available.
Inventors
- 👤 James L Buchanan
- 👤 William B Zelina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:44
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/40; G; G01; G01R; G01R19/00; G01R19/18; G01R19/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1524285A
Cited
US1677191A
Cited
US2146555A
Cited
US2446390A
Cited
US2919416A
Cited
US2905906A
Cited
US3064193A
Cited
US3199051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |