Multipoint control system
Abstract
Abstract A MULTIPLE INDUSTRIAL CONTROL SYSTEM IN WHICH A PLURALITY OF UNITS TO BE CONTROLLED ARE SUCCESSIVELY CONNECTED TO A COMMON SENSOR AND TO A PLURALITY OF THREE MODE CONTROL MODULES, THERE BEING A SEPARATE MODULE FOR EACH UNIT. A MEMORY STORAGE ELEMENT AT THE INPUT OF EACH CONTROL MODULE MAINTAINS THE CONTROL CIRCUITRY AT THE LAST OBSERVED LEVEL OF THE PROCESS VARIABLE DURING THE ENTIRE TIME THAT THE SENSOR IS CONNECTED TO OTHER STATIONS SO AS TO PROVIDE SMOOTH TRANSITION OF CONTROL FROM ONE CYCLE TO THE NEXT. A VARIABLE SWITCHING MEANS DEPENDENT UPON DEMAND ALLOCATED THE DWELL TIME OF THE SENSOR AT ANY ONE UNIT OF STATION TO THE DEMAND OR NEED FOR CORRECTION OF THE PROCESS VARIABLE. AN OVERRIDING TIMING CIRCUIT EFFECTS SWITCHING OF THE CONTROL APPARATUS AFTER A PREDETERMINED DWELL OF THE SENSOR AT ANY ONE STATION, THEREBY PREVENTING UNDUE DWELL OR LOCKING OF THE SENSOR AT A STATION.
Inventors
- 👤 Richard E Evans
- 👤 Frederick W Roberts
Bibliographic Details
Claims Analysis
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |