US3221257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control circuit utilizing input and internal signals controlling reset for providing improved step response
Assignee: Schneider Electric Buildings Americas Inc
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Filing: 1963-02-15
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Granted: 1965-11-30
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Expires: 1983-02-15
Abstract
No abstract record available.
Inventors
- 👤 Gunnar F Ohlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN AN AUTOMATIC CONTROL SYSTEM HAVING IMPROVED RESPONSE UPON MAKING LARGER STEP CHANGES BETEEN THE SET POINT AND THE CONTROLLED CONDITION, THE COMBINATION COMPRISING MEANS TO GENERATE AN INPUT ERROR SIGNAL WHICH VARIES IN SENSE AND MAGNITUDE ACCORDING TO THE DIFFERENCE BETWEEN THE VALUES OF THE SET POINT AND THE CONTROLLED CONDITION, RESET MEANS TO GENERATE A REST SIGNAL WHICH NORMALLY VARIES IN SIGN AND MAGNITUDE ACCORDING TO A TIME INTEGRAL FUNCTION OF SAID DIFFERENCE, CONTROL MEANS COUPLED TO RECEIVE AS INPUTS AT LEAST SAID ERROR SIGNAL AND SAID RESET SIGNAL FOR PRODUCING AN INTERNAL ERROR SIGNAL WHICH VARIES IN JOINT DEPENDENCY UPON SUCH INPUTS, SAID CONTROL MEANS INCLUDING MEANS TO CORRECTLY RESTORE THE CONTROLLED CONDITION TO THE SET POINT WITH PROPORTIONAL PLUS
Claim 2
Dependent Claim
123 words
IN AN AUTOMATIC CONTROL SYSTEM HAVING IMPROVED RESPONSE UPON MAKING LARGER STEP CHANGES BETEEN THE SET POINT AND THE CONTROLLED CONDITION, THE COMBINATION COMPRISING MEANS TO GENERATE AN INPUT ERROR SIGNAL WHICH VARIES IN SENSE AND MAGNITUDE ACCORDING TO THE DIFFERENCE BETWEEN THE VALUES OF THE SET POINT AND THE CONTROLLED CONDITION, RESET MEANS TO GENERATE A REST SIGNAL WHICH NORMALLY VARIES IN SIGN AND MAGNITUDE ACCORDING TO A TIME INTEGRAL FUNCTION OF SAID DIFFERENCE, CONTROL MEANS COUPLED TO RECEIVE AS INPUTS AT LEAST SAID ERROR SIGNAL AND SAID RESET SIGNAL FOR PRODUCING AN INTERNAL ERROR SIGNAL WHICH VARIES IN JOINT DEPENDENCY UPON SUCH INPUTS, SAID CONTROL MEANS INCLUDING MEANS TO CORRECTLY RESTORE THE CONTROLLED CONDITION TO THE SET POINT WITH PROPORTIONAL PLUS
References Cited (Backward Citations)
US2835450A
Cited
US2830245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |