Patent US3216331A successfully refreshed from Google Patents.
US3216331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric-pneumatic process controller
Assignee: Robertshaw Controls Co
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Filing: 1963-05-24
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Granted: 1965-11-09
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Expires: 1983-05-24
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Kreuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:39
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/44; G05B11/48; G05B11/50; F; F15; F15B; F15B21/00; F15B21/08; Y; Y10; Y10T; Y10T74/00; Y10T74/11; Y10T74/19; Y10T74/19535
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A PROCESS CONTROL MEANS FOR CONTROLLING PROCESS PARAMETERS COMPRISING INPUT MEANS FOR SENSING A VARIATION IN A PROCESS PARAMETER AND PRODUCING A DURATION-MODULATED MULTIPLE STATE ELECTRIC SIGNAL IN RESPONSE THERETO, ELECTROPNEUMATIC CONVERTER MEANS FOR PRODUCING A PNEUMATIC PRESSURE CHANGE HAVING A PREDETERMINED FUNCTIONAL RELATIONSHIP WITH SAID ELECTRIC SIGNAL, SAID PRESSURE CHANGE COMPRISING AN INCREASE OR DECREASE OF PNEUMATIC PRESSURE DETERMINED, RESPECTIVELY, BY THE STATE OF SAID ELECTRIC SIGNAL, SAID INCREASE OR DECREASE HAVING A MANITUDE PROPORTIONAL TO THE DURATION OF SAID SIGNAL IN A RESPECTIVE STATE THEREOF, DISPLACEABLE CONTROLLER MEANS ACTUATED BY SAID PNEUMATIC PRESSURE FROM A FIRST POSITION THROUGH A DISPLACEMENT HAVING A DIRECTION DETERMINED BY THE STATE OF SAID ELECTRIC SIGNAL AND A MAGNITUDE DETERMINED BY THE DURATION OF SAID SIGNAL IN A RESPECTIVE STATE THEREOF, AND FEEDBACK MEANS INTERCONNECTING SAID CONTROLLER MEANS AND SAID CONVERTER MEANS, SAID FEEDBACK MEANS ACTING ON SAID CONVERTER MEANS TO CONTINUOUSLY MODULATE SAID CONVERTER MEANS IN RESPONSE TO THE DISPLACEMENT OF SAID CONTROLLER MEANS UNTIL THE EFFECT OF SAID PRESSURE CHANGE ON SAID CONTROLLER MEANS IN EQUALIZED, WHEREBY SAID CONTROLLER MEANS WILL STOP IN A SECOND POTION.
Claim 2
Dependent Claim
185 words
A PROCESS CONTROL MEANS FOR CONTROLLING PROCESS PARAMETERS COMPRISING INPUT MEANS FOR SENSING A VARIATION IN A PROCESS PARAMETER AND PRODUCING A DURATION-MODULATED MULTIPLE STATE ELECTRIC SIGNAL IN RESPONSE THERETO, ELECTROPNEUMATIC CONVERTER MEANS FOR PRODUCING A PNEUMATIC PRESSURE CHANGE HAVING A PREDETERMINED FUNCTIONAL RELATIONSHIP WITH SAID ELECTRIC SIGNAL, SAID PRESSURE CHANGE COMPRISING AN INCREASE OR DECREASE OF PNEUMATIC PRESSURE DETERMINED, RESPECTIVELY, BY THE STATE OF SAID ELECTRIC SIGNAL, SAID INCREASE OR DECREASE HAVING A MANITUDE PROPORTIONAL TO THE DURATION OF SAID SIGNAL IN A RESPECTIVE STATE THEREOF, DISPLACEABLE CONTROLLER MEANS ACTUATED BY SAID PNEUMATIC PRESSURE FROM A FIRST POSITION THROUGH A DISPLACEMENT HAVING A DIRECTION DETERMINED BY THE STATE OF SAID ELECTRIC SIGNAL AND A MAGNITUDE DETERMINED BY THE DURATION OF SAID SIGNAL IN A RESPECTIVE STATE THEREOF, AND FEEDBACK MEANS INTERCONNECTING SAID CONTROLLER MEANS AND SAID CONVERTER MEANS, SAID FEEDBACK MEANS ACTING ON SAID CONVERTER MEANS TO CONTINUOUSLY MODULATE SAID CONVERTER MEANS IN RESPONSE TO THE DISPLACEMENT OF SAID CONTROLLER MEANS UNTIL THE EFFECT OF SAID PRESSURE CHANGE ON SAID CONTROLLER MEANS IN EQUALIZED, WHEREBY SAID CONTROLLER MEANS WILL STOP IN A SECOND POTION.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |