US3531633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrating apparatus using voltage to frequency converter
Assignee: Marathon Oil Co
•
Filing: 1965-06-29
•
Granted: 1970-09-29
•
Expires: 1985-06-29
Abstract
No abstract record available.
Inventors
- 👤 Irvin D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:35
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8603; H; H03; H03K; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1106710A
Cited
US3060388A
Cited
US3230358A
Cited
US3337722A
Cited
US3287640A
Cited
US3361979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |