Patent US3129323A successfully refreshed from Google Patents.
US3129323A
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Fail-safe process control system
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1958-03-26
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Granted: 1964-04-14
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Expires: 1978-03-26
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Stout
- 👤 Charles G Laspe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
G; G05; G05B; G05B9/00; G05B9/02; G05B2219/00; G05B2219/30; G05B2219/42; G05B2219/42084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A PROCESS CONTROL SYSTEM INCLUDING THE COMBINATION OF A PROCESS UNIT HAVING AT LEAST ONE PROCESS VARIABLE, MEANS COUPLED TO THE PROCESS UNIT FOR ADJUSTING THE PROCESS VARIABLE TO CONTROL THE OPERATION OF THE PROCESS, MEANS FOR SENSING AT LEAST ONE PROCESS VARIABLE, A CONTROLLER COUPLED TO THE ADJUSTING MEANS FOR ESTABLISHING A PROCESS VARIABLE AT A PREDETERMINED LEVEL IN ACCORDANCE WITH THE COMPARISON OF A CONTROLLABLE SET POINT SIGNAL AND A SIGNAL REPRESENTING A MEASUREMENT OF AT LEAST ONE PROCESS VARIABLE, A SUMMING DEVICE CONNECTED TO THE CONTROLLER FOR PROVIDING A CONTROLLABLE SET POINT SIGNAL, SAID SUMMING DEVICE HAVING ONE INPUT CIRCUIT FOR RECEIVING A MANUAL SET POINT SIGNAL AND A SECOND INPUT CIRCUIT FOR RECEIVING AN INCREMENTAL ADJUSTMENT SIGNAL, AND A COMPUTER CONNECTED TO THE SECOND INPUT CIRCUIT OF THE SUMMING DEVICE TO PROVIDE AN INCREMENTAL ADJUSTMENT SIGNAL TO THE SUMMING DEVICE WHICH IS COMBINED WITH THE MANUAL SET POINT SIGNAL TO PROVIDE A CONTROLLABLE SET POINT SIGNAL TO THE CONTROLLER FOR ESTABLISHING THE PROCESS VARIABLE AT A DESIRED LEVEL OF OPERATION.
Claim 2
Dependent Claim
174 words
A PROCESS CONTROL SYSTEM INCLUDING THE COMBINATION OF A PROCESS UNIT HAVING AT LEAST ONE PROCESS VARIABLE, MEANS COUPLED TO THE PROCESS UNIT FOR ADJUSTING THE PROCESS VARIABLE TO CONTROL THE OPERATION OF THE PROCESS, MEANS FOR SENSING AT LEAST ONE PROCESS VARIABLE, A CONTROLLER COUPLED TO THE ADJUSTING MEANS FOR ESTABLISHING A PROCESS VARIABLE AT A PREDETERMINED LEVEL IN ACCORDANCE WITH THE COMPARISON OF A CONTROLLABLE SET POINT SIGNAL AND A SIGNAL REPRESENTING A MEASUREMENT OF AT LEAST ONE PROCESS VARIABLE, A SUMMING DEVICE CONNECTED TO THE CONTROLLER FOR PROVIDING A CONTROLLABLE SET POINT SIGNAL, SAID SUMMING DEVICE HAVING ONE INPUT CIRCUIT FOR RECEIVING A MANUAL SET POINT SIGNAL AND A SECOND INPUT CIRCUIT FOR RECEIVING AN INCREMENTAL ADJUSTMENT SIGNAL, AND A COMPUTER CONNECTED TO THE SECOND INPUT CIRCUIT OF THE SUMMING DEVICE TO PROVIDE AN INCREMENTAL ADJUSTMENT SIGNAL TO THE SUMMING DEVICE WHICH IS COMBINED WITH THE MANUAL SET POINT SIGNAL TO PROVIDE A CONTROLLABLE SET POINT SIGNAL TO THE CONTROLLER FOR ESTABLISHING THE PROCESS VARIABLE AT A DESIRED LEVEL OF OPERATION.
References Cited (Backward Citations)
US2932471A
Cited
US2829322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |