US3440538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull meter circuit for producing direct-current and alternating-current outputs proportional to applied alternating signal
Assignee: HP Inc
•
Filing: 1965-10-29
•
Granted: 1969-04-22
•
Expires: 1985-10-29
Abstract
No abstract record available.
Inventors
- 👤 Russell B Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:41
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/0084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2844719A
Cited
US3079565A
Cited
US2955257A
Cited
US2955258A
Cited
US3048789A
Cited
US3231827A
Cited
US3337862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |