US3426274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diode bridge protection circuits for electrical measuring instruments employing the diode forward drop threshold voltage
Assignee: Western Reserve Electronics Inc
•
Filing: 1964-11-19
•
Granted: 1969-02-04
•
Expires: 1984-11-19
Abstract
No abstract record available.
Inventors
- 👤 David S Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/36; H; H02; H02H; H02H3/00; H02H3/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2053445A
Cited
US2282344A
Cited
US2584800A
Cited
US2601473A
Cited
US2671874A
Cited
US2769131A
Cited
US3001101A
Cited
US2948843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |