Patent US4929368A successfully refreshed from Google Patents.
US4929368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoroether grease acoustic couplant
Assignee: Siemens Energy and Automation Inc
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Filing: 1989-07-07
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Granted: 1990-05-29
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Expires: 2009-07-07
Abstract
Abstract A couplant material for establishing a sonic path of good acoustical impedance between an ultrasonic transducer and a sonic medium. The material is capable of being easily shaped at room temperature and withstanding vibration and thermal cycling from room temperature to over 500° F. while substantially maintaining its acoustical properties and providing a minimum of irritating fumes and outgasses. A preferred couplant material is a polytetrafluoroethylene grease or perfluoropolyalkylether grease, which have been used previously as lubricants.
Inventors
- 👤 Joseph Baumoel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:29
CPC Classifications
C; C10; C10M; C10M107/00; C10M107/38; G; G01; G01F; G01F1/00; G01F1/66; G01F1/662; G10; G10K; G10K11/00; G10K11/02; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/04; C10M2213/06; C10M2213/062; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
In combination; an ultrasonic transducer, a conduit for carrying fluid which is at a temperature in excess of 500° F., a clamping structure for clamping a surface of said transducer to the exterior surface of said conduit, and a sonic coupling fluid disposed between said surface of said transducer and said exterior surface; said coupling fluid comprising a fluoroether grease.
Claim 2
Dependent Claim
60 words
In combination; an ultrasonic transducer, a conduit for carrying fluid which is at a temperature in excess of 500° F., a clamping structure for clamping a surface of said transducer to the exterior surface of said conduit, and a sonic coupling fluid disposed between said surface of said transducer and said exterior surface; said coupling fluid comprising a fluoroether grease.
Claim 3
Dependent Claim
21 words
The combination of claim 1, wherein said fluoroether grease is selected from the group consisting of polytetrafluoroethylene grease and perfluoropolyalkylether grease.
Claim 4
Dependent Claim
13 words
The combination of claim 1, wherein the fluoroether grease is a polytetrafluoroethylene grease.
Claim 5
Dependent Claim
13 words
The combination of claim 1, wherein said fluoroether grease is a perfluoropolyalkylether grease.
Claim 6
Dependent Claim
20 words
The combination of claim 4, wherein said perfluoropolyalkylether grease is a fluorine-end-capped homopolymer of hexafluoropropylene epoxide containing a thickening agent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |