Differential pressure measuring apparatus
Abstract
Abstract A DIFFERENTIAL-PRESSURE TRANSMITTER TO PRODUCE A D-C OUTPUT SIGNAL CORRESPONDING TO A DIFFERENCE IN INPUT PRESSURES, THE INSTRUMENT HAVING A FORCE-BALANCE MECHANISM WHICH IS STATICALLY BALANCED TO PERMIT OPERATION IN ANY ANGULAR ORIENTATION WITH RESPECT TO GRAVITY, THE FORCE-BALANCE MECHANISM INCLUDING A VERNIER RANGE-CHANGING STRUCTURE IN THE FORM OF A FLEXURED REACTION ELEMENT AND ROTATABLE SUPPORT ELEMENT ADAPTED TO CHANGE RANGE WITHOUT ALTERING THE STATIC BALANCE OF THE INSTRUMENT, LARGE CHANGES IN RANGE BEING EFFECTED BY CHANGING THE NUMBER OF EFFECTIVE TURNS OF THE MOTOR WINDING, THERE ALSO BEING PROVIDED A FORCE BAR SUPPORT STRUCTURE INCLUDING STRUTS PIVOTED AT PRECISELY DEFINED POSITIONS, THE INSTRUMENT FURTHER INCLUDING A REBALANCE MOTOR HAVING A CYLINDRICAL PERMANENT MAGNET AND SURROUNDING MAGNETIC MATERIAL RECESSED NEAR THE MOTOR WINDING TO REDUCE LEAKAGE FLUX.
Inventors
- 👤 Howard W Nudd Jr
- 👤 Robert J Robinson
- 👤 James W Graham
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |