US5857340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passive frequency stabilization in an acoustic resonator
Assignee: Individual
•
Filing: 1997-11-10
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Granted: 1999-01-12
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Expires: 2017-11-10
Abstract
Abstract The resonance frequency of a gas-filled acoustic resonator (12) is stabilized against changes in frequency due to changes in the temperature of the gas and resonator (12) by placing a gas mixture and an adsorbent (16) within the resonator (12). If the temperature dependence of the adsorbency is different for the different species comprising the gas mixture, then it is shown that the proper amount of adsorbent (16) can maintain the acoustic resonant frequency of the gas mixture within resonator (12) very nearly equal to a constant frequency.
Inventors
- 👤 Steven L. Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:31
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F25B9/145; F02; F02G; F02G2243/00; F02G2243/30; F02G2243/50; F02G2243/52; F25B2309/00; F25B2309/14; F25B2309/1404; F25B2309/1411; F25B2309/1421; F25B9/002; F25B9/006
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
An apparatus having a temperature stabilized acoustic resonant frequency at a first and a second temperature, the apparatus comprising: an acoustic resonator having a cavity; a mixture of two or more gases contained within said cavity; and an adsorbent material in fluid contact with said gases, the adsorbency of said adsorbent material having a temperature dependence which is a different function of temperature for each of said two or more gases.
Claim 2
Independent Claim
71 words
An apparatus having a temperature stabilized acoustic resonant frequency at a first and a second temperature, the apparatus comprising: an acoustic resonator having a cavity; a mixture of two or more gases contained within said cavity; and an adsorbent material in fluid contact with said gases, the adsorbency of said adsorbent material having a temperature dependence which is a different function of temperature for each of said two or more gases.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1, wherein said mixture consists essentially of two gases.
Claim 4
Dependent Claim
11 words
The apparatus of claim 1, wherein said gases comprise inert gases.
Claim 5
Dependent Claim
12 words
The apparatus of claim 3, wherein said gases are helium and xenon.
Claim 6
Dependent Claim
33 words
The apparatus of claim 4, wherein the molar percentage of xenon is in the range of 1 to 40% and the molar percentage of helium is in the range of 60 to 99%.
Claim 7
Dependent Claim
33 words
The apparatus of claim 4, wherein the molar percentage of xenon is in the range of 8 to 12% and the molar percentage of helium is in the range of 88 to 92%.
Claim 8
Dependent Claim
22 words
The apparatus of claim 1, wherein said adsorbent material is disposed within said cavity near a location corresponding to a velocity anti-node.
Claim 9
Dependent Claim
13 words
The apparatus of claim 1, wherein said adsorbent material is a molecular sieve.
Claim 10
Dependent Claim
12 words
The apparatus of claim 1, wherein said adsorbent material is activated carbon.
Claim 11
Dependent Claim
11 words
The apparatus of claim 9, wherein said adsorbent material is zeolite.
Claim 12
Dependent Claim
23 words
The apparatus of claim 1, wherein said gases are selected from the group consisting of inert gases, sulfur hexafluoride, halocarbons, and combinations thereof.
Claim 13
Independent Claim
83 words
A method for providing an acoustic resonator having a temperature stabilized acoustic resonant frequency at a first and a second temperature, the method comprising the steps of: a. providing an acoustic resonator having a cavity; b. disposing a mixture of two or more gases within said cavity; c. disposing an adsorbent material in fluid contact with said gases, the adsorbency of said adsorbent material having a temperature dependence which is a different function of temperature for each of said two or more gases.
Claim 14
Independent Claim
83 words
A method for providing an acoustic resonator having a temperature stabilized acoustic resonant frequency at a first and a second temperature, the method comprising the steps of: a. providing an acoustic resonator having a cavity; b. disposing a mixture of two or more gases within said cavity; c. disposing an adsorbent material in fluid contact with said gases, the adsorbency of said adsorbent material having a temperature dependence which is a different function of temperature for each of said two or more gases.
References Cited (Backward Citations)
US5647216A
Cited
US5673561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |