US3473122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital voltmeter
Assignee: Hickok Electrical Instrument Co
•
Filing: 1966-12-05
•
Granted: 1969-10-14
•
Expires: 1986-12-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick R Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:17
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/25; G01R19/252; H; H03; H03M; H03M1/00; H03M1/12; H03M1/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2497961A
Cited
US3064193A
Cited
US3041535A
Cited
US3159787A
Cited
US3201781A
Cited
US3327229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |