US3480858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital capacity measuring instrument including a difference amplifier and a direct current-to-frequency converter
Assignee: Hickok Electrical Instrument Co
•
Filing: 1968-02-21
•
Granted: 1969-11-25
•
Expires: 1988-02-21
Abstract
No abstract record available.
Inventors
- 👤 Robert L Bauman
- 👤 Frederick Rodney Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605; H; H03; H03K; H03K7/00; H03K7/06; H03M; H03M1/00; H03M1/12; H03M1/60
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) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |