Continuous production of calibration gas flows
Abstract
Abstract THE CONTINUOUS PRODUCTION OF VERY LOW PREDETERMINABLE CONCENTRATIONS OF GASES IN THE RANGE FROM ABOUT 10-9 TO 10**-13 GM./CC IS DESCRIBED. THE PROPERTIES OF NONPOROUS PERMEABLE MEMBRANES ARE EMPLOYED TO CONTROLLABLY PROVIDE PRESELECTED VERY LOW CONCENTRATIONS OF SOME GIVEN GAS IN A CHAMBER HAVING THE SELECTIVELY PERMEABLE MEMBRANE AS AT LEAST PART OF THE WALL AREA THEREOF. IN ESSENCE THE MEMBRANE IS EMPLOYED AS A FLOW CONTROL VALVE FOR THE MOLECULAR SPECIE OF INTEREST. A MEASURED FLOW OF DILUTION GAS IS MIXED WITH THE PREDETERMINED AMOUNT OF THE GIVEN GAS, WHICH HAS PASSED THROUGH THE MEMBRANE WALL AREA CREATING A MIXED FLOW HAVING A STILL LOWER CONCENTRATION IN THE GIVEN GAS. THIS FLOW, WHICH IS RELATIVELY LARGE, IS CONDUCTED TO TRACE GAS MEASURING EQUIPEMENT FOR THE CALIBRATION THEREOF WITH RESPECT TO DETECTION OF THE GIVEN GAS.
Inventors
- 👤 Frank W Van Luik Jr
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |