Patent US3175764A successfully refreshed from Google Patents.
US3175764A
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Pneumatic compensating control circuit to minimize process dead time
Assignee: Phillips Petroleum Co
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Filing: 1961-06-12
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Granted: 1965-03-30
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Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 Dale E Lupfer
- 👤 Jr Minor W Oglesby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:06
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/44; G05B11/48; G05B11/50; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/2452
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
APPARATUS FOR CONTROLLING A PROCESS VARIABLE WHICH COMPRISES, IN COMBINATION, MEANS FOR MEASURING SAID PROCESS VARIABLE, MEANS FOR TRANSMITTING A FIRST PNEUMATIC PRESSURE REPRESENTATIVE OF SAID MEASUREMENT TO A FIRST COMPUTING MEANS AS AN INPUT A A1, SAID FIRST COMPUTING MEANS CAPABLE OF SOLVING THE EQUATION:
Claim 2
Dependent Claim
46 words
APPARATUS FOR CONTROLLING A PROCESS VARIABLE WHICH COMPRISES, IN COMBINATION, MEANS FOR MEASURING SAID PROCESS VARIABLE, MEANS FOR TRANSMITTING A FIRST PNEUMATIC PRESSURE REPRESENTATIVE OF SAID MEASUREMENT TO A FIRST COMPUTING MEANS AS AN INPUT A A1, SAID FIRST COMPUTING MEANS CAPABLE OF SOLVING THE EQUATION:
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |