US3939101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for ultrasonic inspection of objects and method for employing same
Assignee: Boeing North American Inc
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Filing: 1974-02-21
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Granted: 1976-02-17
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Expires: 1994-02-21
Abstract
Abstract Composition for ultrasonic inspection of surface and subsurface flaws and discontinuities in bodies, in the form of an aqueous gel containing an N-alkyl-2-pyrrolidone having a short alkyl chain, preferably N-methyl-2-pyrrolidone, a water soluble surfactant, e.g. a nonyl phenyl ether of polyethylene glycol, and silica, preferably in fine powder form, suspended uniformly in the gel. The composition or gel is applied to a surface of a body such as a metal aircraft structural part, and a probe or transducer of an ultrasonic testing device is contacted or pressed against the gel and the transducer is caused to move or slide in various directions on the gel to transmit ultrasonic energy through the gel and the object, to inspect the object and locate any surface or subsurface flaws or discontinuities.
Inventors
- 👤 Orlando G. Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:15
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/28
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
40 words
A composition for ultrasonic inspection of surface and subsurface flaws and discontinuities, comprising an aqueous gel containing an N-alkyl-2-pyrrolidone wherein the alkyl group contains from 1 to 4 carbon atoms, a water soluble surfactant and silica suspended in said gel.
Claim 2
Dependent Claim
40 words
A composition for ultrasonic inspection of surface and subsurface flaws and discontinuities, comprising an aqueous gel containing an N-alkyl-2-pyrrolidone wherein the alkyl group contains from 1 to 4 carbon atoms, a water soluble surfactant and silica suspended in said gel.
Claim 3
Dependent Claim
11 words
A composition as defined in claim 1, said pyrrolidone being N-methyl-2-pyrrolidone.
Claim 4
Dependent Claim
19 words
A composition as defined in claim 1, said water soluble surfactant being a nonyl phenyl ether of polyethylene glycol.
Claim 5
Dependent Claim
13 words
A composition as defined in claim 1, wherein said silica is fumed silica.
Claim 6
Dependent Claim
25 words
A composition as defined in claim 1, wherein said pyrrolidone is N-methyl-2-pyrrolidone and said water soluble surfactant is a nonyl phenyl ether of polyethylene glycol.
Claim 7
Dependent Claim
13 words
A composition as defined in claim 5, wherein said silica is fumed silica.
Claim 8
Dependent Claim
14 words
A composition as defined in claim 1 including a small amount of a dye.
Claim 9
Dependent Claim
15 words
A composition as defined in claim 6, including a small amount of a fluorescent dye.
Claim 10
Dependent Claim
71 words
A composition for ultrasonic inspection of surface and subsurface flaws and discontinuities, comprising a gel consisting essentially of about 10 to about 40 percent of an N-alkyl-2-pyrrolidone wherein the alkyl group contains from 1 to 4 carbon atoms, about 10 to about 35 percent of a water soluble surfactant, about 10 to about 50 percent water and about 10 to about 40 percent powdered silica distributed in said gel, by weight.
Claim 11
Dependent Claim
71 words
A composition for ultrasonic inspection of surface and subsurface flaws and discontinuities, comprising a gel consisting essentially of about 10 to about 40 percent of an N-alkyl-2-pyrrolidone wherein the alkyl group contains from 1 to 4 carbon atoms, about 10 to about 35 percent of a water soluble surfactant, about 10 to about 50 percent water and about 10 to about 40 percent powdered silica distributed in said gel, by weight.
Claim 12
Dependent Claim
11 words
A composition as defined in claim 9, said pyrrolidone being N-methyl-2-pyrrolidone.
Claim 13
Dependent Claim
19 words
A composition as defined in claim 9, said water soluble surfactant being a nonyl phenyl ether of polyethylene glycol.
Claim 14
Dependent Claim
32 words
A composition as defined in claim 9, wherein said pyrrolidone is N-methyl-2-pyrrolidone and said water soluble surfactant is a nonyl phenyl ether of polyethylene glycol, and wherein said water is deionized water.
Claim 15
Dependent Claim
53 words
A composition as defined in claim 9, said gel consisting essentially of about 15 to about 35 percent of said pyrrolidone, about 15 to about 30 percent of said water soluble surfactant, about 15 to about 40 percent of deionized water and about 10 to about 25 percent of fumed silica, by weight.
Claim 16
Dependent Claim
19 words
A composition as defined in claim 9, including about 0.1 to about 2 percent by weight of a dye.
Claim 17
Dependent Claim
14 words
A composition as defined in claim 14, wherein said dye is a fluorescent dye.
Claim 18
Dependent Claim
20 words
A composition as defined in claim 13, including about 0.2 to about 1.5 percent by weight of a fluorescent dye.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |