Patent US3445638A successfully refreshed from Google Patents.
US3445638A
Expired / Lapsed
US
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Process control apparatus in which a measured value is controlled in comparison with a desired value
Assignee: Serck R&D Ltd
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Filing: 1965-03-12
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Granted: 1969-05-20
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Expires: 1985-03-12
Abstract
No abstract record available.
Inventors
- 👤 George A Montgomerie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:18
CPC Classifications
G; G05; G05B; G05B1/00; G05B1/01; G05B1/03; G05D; G05D23/00; G05D23/19; G05D23/1917; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
PROCESS CONTROL APPARATUS HAVING A CONTROL ELEMENT FOR A PROCESS HAVING A VARIABLE PARAMETER RESPONSIVE TO CONTROL OF THE PROCESS COMPRISING A FIRST COUNTING DEVICE, MEANS FOR PRODUCING IN SAID COUNTING DEVICE A COUNT STATE CORRESPONDING TO THE DESIRED VALUE OF THE PARAMETER, FIRST MEANS, INCLUDING AN ELEMENT SENSITIVE TO THE VALUE OF THE PARAMETER, FOR PRODUCING A PULSATING SIGNAL THE MEANS FREQUENCY OF WHICH IS DEPENDENT ON THE VALUE OF THE PARAMETER, MEANS ARRANGED TO VARY THE COUNT STATE OF THE COUNTING DEVICE BY A NUMBER DEPENDENT OF SAID FREQUENCY, AND MEANS SENSITIVE TO THE FINAL COUNT STATE OF THE COUNTING DEVICE TO ADJUST THE CONTROL ELEMENT.
Claim 2
Dependent Claim
108 words
PROCESS CONTROL APPARATUS HAVING A CONTROL ELEMENT FOR A PROCESS HAVING A VARIABLE PARAMETER RESPONSIVE TO CONTROL OF THE PROCESS COMPRISING A FIRST COUNTING DEVICE, MEANS FOR PRODUCING IN SAID COUNTING DEVICE A COUNT STATE CORRESPONDING TO THE DESIRED VALUE OF THE PARAMETER, FIRST MEANS, INCLUDING AN ELEMENT SENSITIVE TO THE VALUE OF THE PARAMETER, FOR PRODUCING A PULSATING SIGNAL THE MEANS FREQUENCY OF WHICH IS DEPENDENT ON THE VALUE OF THE PARAMETER, MEANS ARRANGED TO VARY THE COUNT STATE OF THE COUNTING DEVICE BY A NUMBER DEPENDENT OF SAID FREQUENCY, AND MEANS SENSITIVE TO THE FINAL COUNT STATE OF THE COUNTING DEVICE TO ADJUST THE CONTROL ELEMENT.
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |