US3117310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniaturized electronic indicating controller unit for process control systems
Assignee: Robertshaw Controls Co
•
Filing: 1957-04-29
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Granted: 1964-01-07
•
Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Roper Charles Garland
- 👤 Edgar S Gilchrist
- 👤 Harry E Lockery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:33
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN AN AUTOMATIC PROCESS CONTROL SYSTEM, A PIVOTED MEMBER INCLUDING A CONTROL ELEMENT, ELECTROMAGNETIC CURRENT RESPONSIVE MEANS FOR DEFLECTING SAID MEMBER, MEANS FOR DEVELOPING AN INPUT CURRENT SIGNAL VARIABLE OVER A PREDETERMINED RANGE IN ACCORDANCE WITH A MEASURED VARIABLE OF THE PROCESS, MEANS FOR DEVELOPING AN ELECTRICAL SIGNAL REPRESENTING A SET POINT WHICH IS MANUALLY VARIABLE OVER SAID PREDETERMINED RANGE, MEANS FOR APPLYING SAID INPUT SIGNAL AND SAID SET POINT SIGNAL IN OPPOSITION TO SAID ELECTROMAGNETIC CURRENT RESPONSIVE MEANS, MEANS RESPONSIVE TO MOVEMENT OF SAID CONTROL ELEMENT FOR DEVELOPING AN OUTPUT CURRENT SIGNAL WHICH IS PROPORTIONAL TO THE DEVIATION OF SAID INPUT CURRENT SIGNAL FROM SAID ELECTRICAL SET POINT SIGNAL, AND MEANS RESPONSIVE TO SAID OUTPUT CURRENT FOR APPLYING A NEGATIVE FEEDBACK FORCE TO SAID MEM-
Claim 2
Dependent Claim
126 words
IN AN AUTOMATIC PROCESS CONTROL SYSTEM, A PIVOTED MEMBER INCLUDING A CONTROL ELEMENT, ELECTROMAGNETIC CURRENT RESPONSIVE MEANS FOR DEFLECTING SAID MEMBER, MEANS FOR DEVELOPING AN INPUT CURRENT SIGNAL VARIABLE OVER A PREDETERMINED RANGE IN ACCORDANCE WITH A MEASURED VARIABLE OF THE PROCESS, MEANS FOR DEVELOPING AN ELECTRICAL SIGNAL REPRESENTING A SET POINT WHICH IS MANUALLY VARIABLE OVER SAID PREDETERMINED RANGE, MEANS FOR APPLYING SAID INPUT SIGNAL AND SAID SET POINT SIGNAL IN OPPOSITION TO SAID ELECTROMAGNETIC CURRENT RESPONSIVE MEANS, MEANS RESPONSIVE TO MOVEMENT OF SAID CONTROL ELEMENT FOR DEVELOPING AN OUTPUT CURRENT SIGNAL WHICH IS PROPORTIONAL TO THE DEVIATION OF SAID INPUT CURRENT SIGNAL FROM SAID ELECTRICAL SET POINT SIGNAL, AND MEANS RESPONSIVE TO SAID OUTPUT CURRENT FOR APPLYING A NEGATIVE FEEDBACK FORCE TO SAID MEM-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |