Patent US4815450A successfully refreshed from Google Patents.
US2808316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process control apparatus
Assignee: EIDP Inc
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Filing: 1954-07-22
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Granted: 1957-10-01
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Expires: 1974-07-22
Abstract
No abstract record available.
Inventors
- 👤 Edgar B Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
C; C07; C07B; C07B61/00; C07C; C07C63/00; C07C63/14; C07C63/15; C07C63/26; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
A CONTROLE APPARATUS FOR A CHEMICAL PROCESS IN WHICH A MUTUALLY DEPENDENT RELATIONSHIP EXIST BETWEEN TWO OR MORE PROCESS VARIABLES COMPRISING, IN COMBINATION, INDIVIDUAL SENSING MEANS FOR EACH OF AT LEAST TWO OF SAID PROCESS VARIABLES DELIVERING OUTPUT SIGNALS REPRESENTATIVE OF THE MAGNITUDES OF SAID PROCESS VARIABLES, ONE OF SAID PROCESS VARIABLES BEING THE VARIABLE UPON WHICH CONTROL IS BASED AND ONE OR MORE OF SAID OTHER PROCESS VARIABLES BEING VARIABLES WHICH ARE, TO BE CONTROLLED, MEANS RESPONSIVE TO THE SIGNAL REPRESENTATIVE OF SAID VARIABLE UPON WHICH CONTROL IS BASED CHARACTERIZING SAID CHEMICAL PROCESS IN TERMS OF A PRESELECTED PROCESS VARIABLE INTERRELATIONSHIP, SAID LAST-MENTIONED MEANS DELIVERING A CHARACTERIZED OUTPUT SIGNAL CORRESPONDING TO THE VALUE OF SAID VARIABLES WHICH ARE TO BE CONTROLLED AT THE EXISTING MAGNITUDE OF SAID VARIABLE UPON WHICH CONTROL IS BASED, MEANS RESPONSIVE TO THE OUTPUT SIGNALS OF THE SENSING MEANS FOR SAID VARIABLES WHICH ARE TO BE CONTROLLED AND TO SAID CHARACTERIZED OUTPUT SIGNAL FOR DERIVING A DIFFERENCE SIGNAL, AND MEANS RESPONSIVE TO SAID DIFFERENCE SIGNAL FOR CONTROLLING THE MAGNITUDE OF SAID PROCESS VARIABLES TO BE CONTROLLED TO SUBSTANTIAL CONFORMITY WITH SAID PRESELECTED PROCESS VARIABLE INTERRELATIONSHIP.
Claim 2
Dependent Claim
190 words
A CONTROLE APPARATUS FOR A CHEMICAL PROCESS IN WHICH A MUTUALLY DEPENDENT RELATIONSHIP EXIST BETWEEN TWO OR MORE PROCESS VARIABLES COMPRISING, IN COMBINATION, INDIVIDUAL SENSING MEANS FOR EACH OF AT LEAST TWO OF SAID PROCESS VARIABLES DELIVERING OUTPUT SIGNALS REPRESENTATIVE OF THE MAGNITUDES OF SAID PROCESS VARIABLES, ONE OF SAID PROCESS VARIABLES BEING THE VARIABLE UPON WHICH CONTROL IS BASED AND ONE OR MORE OF SAID OTHER PROCESS VARIABLES BEING VARIABLES WHICH ARE, TO BE CONTROLLED, MEANS RESPONSIVE TO THE SIGNAL REPRESENTATIVE OF SAID VARIABLE UPON WHICH CONTROL IS BASED CHARACTERIZING SAID CHEMICAL PROCESS IN TERMS OF A PRESELECTED PROCESS VARIABLE INTERRELATIONSHIP, SAID LAST-MENTIONED MEANS DELIVERING A CHARACTERIZED OUTPUT SIGNAL CORRESPONDING TO THE VALUE OF SAID VARIABLES WHICH ARE TO BE CONTROLLED AT THE EXISTING MAGNITUDE OF SAID VARIABLE UPON WHICH CONTROL IS BASED, MEANS RESPONSIVE TO THE OUTPUT SIGNALS OF THE SENSING MEANS FOR SAID VARIABLES WHICH ARE TO BE CONTROLLED AND TO SAID CHARACTERIZED OUTPUT SIGNAL FOR DERIVING A DIFFERENCE SIGNAL, AND MEANS RESPONSIVE TO SAID DIFFERENCE SIGNAL FOR CONTROLLING THE MAGNITUDE OF SAID PROCESS VARIABLES TO BE CONTROLLED TO SUBSTANTIAL CONFORMITY WITH SAID PRESELECTED PROCESS VARIABLE INTERRELATIONSHIP.
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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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |