Spirometer with normalizing means
Abstract
Abstract A SPIROMETER HAS A FLOWMETER FOR MEASURING THE FLOW RATE OF AIR BLOWN THROUGH A TUBE BY A PATIENT, AND A CALIBRATOR FOR PRODUCING AN ELECTRICAL SIGNAL PROPORTIONAL TO THE VOLUME PER SECOND OF AIR EXPIRED. THE ELECTRICAL SIGNAL IS DETECTED BY A SWITCH WHICH ACTUATES A TIMER FOR HOLDING A GATE OPEN FOR ONE SECOND TO APPLY THE ELECTRICAL SIGNAL TO AN INTEGRATOR FOR ONE SECOND TO PRODUCE AN OUTPUT SIGNAL REPRESENTING THE VOLUME OF AIR EXPIRED BY THE PATIENT IN ONE SECOND. A NORMALIZE CIRCUIT PRODUCES AN OUTPUT SIGNAL REPRESENTING THE VOLUME OF AIR EXPIRED IN ONE SECOND BY A NORMAL PERSON HAVING THE SAME HEIGHT, SEX, AND AGE AS THE PATIENT. THE OUTPUT SIGNALS FROM THE NORMALIZE CIRCUIT AND THE INTEGRATOR ARE COMPARED TO PRODUCE A SIGNAL REPRESENTING THE PATIENT''S DEVIATION FROM NORMAL.
Inventors
- 👤 Kurt P Poirier
- 👤 Paul A Lux
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |