Patent US3493912A successfully refreshed from Google Patents.
US3443215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance measuring bridge with voltage divider providing constant source impedance to bridge
Assignee: Individual
•
Filing: 1965-09-15
•
Granted: 1969-05-06
•
Expires: 1985-09-15
Abstract
No abstract record available.
Inventors
- 👤 Frank R Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/10; G01R17/105
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |