US4616501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for determining gas concentration
Assignee: American Sterilizer Co
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Filing: 1985-04-23
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Granted: 1986-10-14
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Expires: 2005-04-23
Abstract
Abstract A system employs ultrasound to determine the concentration of gases present within a chamber. The system causes ultrasound to propagate through the chamber at each of at least two operating frequencies. The amplitude of the ultrasound at a predetermined point within the chamber is recorded for each operating frequency to form a set of measured amplitudes. The set of measured amplitudes is compared to a mathematical model developed experimentally that expresses the amplitude response of the system.
Inventors
- 👤 Douglas M. Mechlenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:38
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/032; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02809
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A system that provides an indication of the concentration of at least one gas present within a chamber comprising: means for causing mechanical radiant energy to propagate through the chamber at at least two operating frequencies which provide unique information over at least a portion of various gas concentrations; means for measuring the amplitude of said propagating mechanical radiant energy at each operating frequency at a predetermined point within the chamber; and means for fitting said measured amplitudes to a modeled amplitude response representative of a plurality of concentrations of the at least one gas to determine the concentration of the at least one gas present in the chamber.
Claim 2
Independent Claim
109 words
A system that provides an indication of the concentration of at least one gas present within a chamber comprising: means for causing mechanical radiant energy to propagate through the chamber at at least two operating frequencies which provide unique information over at least a portion of various gas concentrations; means for measuring the amplitude of said propagating mechanical radiant energy at each operating frequency at a predetermined point within the chamber; and means for fitting said measured amplitudes to a modeled amplitude response representative of a plurality of concentrations of the at least one gas to determine the concentration of the at least one gas present in the chamber.
Claim 3
Dependent Claim
33 words
The system of claim 1 wherein said means for fitting includes a means for storing a table of test data and means for comparing said measured amplitudes to said table of test data.
Claim 4
Dependent Claim
20 words
The system of claim 1 wherein said means for fitting includes means for simultaneously solving a set of characteristic equations.
References Cited (Backward Citations)
US3981176A
Cited
US4520654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |