Patent US3526839A successfully refreshed from Google Patents.
US3526839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic controller for process control system
Assignee: Fischer and Porter Co
•
Filing: 1967-03-03
•
Granted: 1970-09-01
•
Expires: 1987-03-03
Abstract
No abstract record available.
Inventors
- 👤 Roy F Schmoock
- 👤 Hubert A Riester Jr
- 👤 Peter S Levesque
- 👤 Isao Asai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:12
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/36; G05B11/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2917696A
Cited
US2974237A
Cited
US2901563A
Cited
US3197711A
Cited
US3077566A
Cited
US3371286A
Cited
US3413561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |