US3195982A
Expired / Lapsed
US
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Continuous automatic process control method and system
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1961-07-27
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Granted: 1965-07-20
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Expires: 1981-07-27
Abstract
No abstract record available.
Inventors
- 👤 Margie M Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:15
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0086; G; G01; G01N; G01N31/00; G01N31/16; G01N31/166; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034; Y10T137/2496; Y10T137/2499; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
137 words
A CONTINUOUS AUTOMATIC PROCESS CONTROL METHOD FOR CONTROLLING THE ADDITION OF FRESH CHEMICAL TO THE PROCESS STREAM COMPRISING THE STEPS OF: POTENTIOMETRICALLY TITRATING TWO SAMPLE PORTIONS FROM THE PROCESS STREAM, THE RATIO OF TITRANT TO SAMPLE IN THE FIRST PORTION BEING MORE THAN THE RATIO OF TITRANT TO SAMPLE IN THE SECOND PORTION; APPLYING A CONTROL VOLTAGE ACROSS THE ELECTRODES USED TO TITRATE THE TWO SAMPLE PORTIONS SO AS TO PROVIDE POTENTIALS TO SAID ELECTRODES LYING ON THE SHOULDER OF THE TITRATION CURVE; ELECTRICALLY SENSING ANY VARIATION OF THE TITRATION POTENTIAL FROM THE CONTROL VOLTAGE; TRANSMITTING AN ERROR SIGNAL; ADJUSTING THE TITRANT FLOW TO CORRECT FOR SAID VARIATION AND RENDER THE TITRATION POTENTIAL AND CONTROL VOLTAGE EQUAL; AND ADDING FRESH CHEMICAL TO THE PROCESS STREAM IN RESPONSE TO CHANGES IN THE TOTAL AMOUNT OF SAMPLE AND TITRANT.
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) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |