US3777157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water washable dye penetrant composition and method of application
Assignee: Boeing North American Inc
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Filing: 1973-01-24
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Granted: 1973-12-04
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Expires: 1993-01-24
Abstract
Abstract A water washable dye penetrant composition for use in nondestructive testing of objects to locate voids and defects therein, containing an organic dye, preferably a fluorescent dye, a solvent for said dye, particularly an N-alkyl-2-pyrrolidone, e.g. N-methyl-2-pyrrolidone, and glycol monobutyl ether for thinning the dye penetrant solution substantially without changing any of its original functional characteristics, and particularly without affecting the sensitivity of the penetrant. In the method of application of the dye penetrant composition, such composition is applied to the surface of an object containing cracks and flaws, water is applied to the surface of the object, preferentially removing the glycol monobutyl ether vehicle or carrier, and momentarily leaving the remaining dye penetrant uniformly distributed on the surface, which is finally washed off the part, both the removal of the glycol ether component and the remaining dye penetrant occurring in the same washing operation. The part is then inspected under appropriate lighting conditions such as fluorescent or black light, to obtain colored traces from the dye penetrant remaining in the cracks and flaws.
Inventors
- 👤 O Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
17 words
A water washable liquid dye penetrant composition as defined in claim 1, wherein said pyrrolidone is N-methyl-2-pyrrolidone.
Claim 2
Dependent Claim
19 words
A water washable liquid dye penetrant composition as defined in claim 1, wherein said dye is a fluorescent dye.
Claim 3
Dependent Claim
19 words
A water washable liquid dye penetrant composition as defined in claim 2, wherein said dye is a fluorescent dye.
Claim 4
Dependent Claim
33 words
A water washable liquid dye penetrant composition as defined in claim 1, said glycol monobutyl ether being employed in a proportion of about 20 to about 50 percent by volume of said composition.
Claim 5
Dependent Claim
33 words
A water washable liquid dye penetrant composition as defined in claim 4, said glycol monobutyl ether being employed in a proportion of about 20 to about 50 percent by volume of said composition.
Claim 6
Dependent Claim
48 words
A water washable liquid dye penetrant composition as defined in claim 1, the ratio of said dye to said pyrrolidone ranging from about 1 part of dye to about 25 parts of pyrrolidone, to about 2 parts of said dye to about 1 part of pyrrolidone, by volume.
Claim 7
Dependent Claim
68 words
A water washable liquid dye penetrant composition as defined in claim 6, said pyrrolidone being employed in an amount ranging from about 3 to about 85 percent by volume of said composition, the ratio of said dye to said pyrrolidone ranging from about 1 part of dye to about 25 parts of pyrrolidone, to about 2 parts of said dye to about 1 part of pyrrolidone, by volume.
Claim 8
Dependent Claim
18 words
A water washable liquid dye penetrant composition as defined in claim 1, said composition additionally including a surfactant.
Claim 9
Dependent Claim
30 words
A water washable liquid dye penetrant composition as defined in claim 8, said composition additionally including a surfactant selected from the group consisting of water soluble and water insoluble surfactants.
Claim 10
Dependent Claim
21 words
A water washable liquid dye penetrant composition as defined in claim 1, said composition additionally including a surfactant and a ketone.
Claim 11
Dependent Claim
33 words
A water washable liquid dye penetrant composition as defined in claim 8, said composition additionally including a surfactant selected from the group consisting of water soluble and water insoluble surfactants, and a ketone.
Claim 12
Dependent Claim
35 words
A water washable liquid dye penetrant composition as defined in claim 1, said composition additionally including a surfactant selected from the group consisting of water soluble and water insoluble nonyl phenyl ether of polyethylene glycol.
Claim 13
Dependent Claim
39 words
A water washable liquid dye penetrant composition as defined in claim 8, said composition additionally including a surfactant selected from the group consisting of water soluble and water insoluble nonyl phenyl ether of polyethylene glycol, and isobutyl heptyl ketone.
Claim 14
Independent Claim
160 words
A method for detecting cracks and flaws in the surface of an object, which comprises applying to said surface a water washable liquid dye penetrant which consists essentially of an N-alkyl-2-pyrrolidone, said alkyl group containing from one to four carbon atoms, a dye which is soluble in said pyrrolidone, and about 10 to about 60 percent by volume of said dye penetrant composition, of glycol monobutyl ether, applying a water wash to the surface of said object over said dye penetrant composition thereon, and preferentially removing said glycol monobutyl ether from said dye penetrant composition, followed substantially instantaneously by removing the remaining liquid dye penetrant uniformly distributed on said surface, during said water wash application, a portion of said last mentioned liquid penetrant free of said glycol monobutyl ether remaining in said cracks and flaws in said surface, and viewing the surface of said object under lighting conditions to obtain colored traces from the dye in said cracks and flaws.
Claim 15
Dependent Claim
37 words
A method as defined in claim 15, in which, following said preferential removal of said glycol monobutyl ether, said remaining liquid dye penetrant is momentarily left on said surface, and is finally removed by said water wash.
Claim 16
Dependent Claim
26 words
A method as defined in claim 15, said water wash being carried out by application of a sprayed mixture of air and water over said surface.
Claim 17
Dependent Claim
19 words
A method as defined in claim 15, said water wash being carried out by spraying water over said surface.
Claim 18
Dependent Claim
38 words
A method as defined in claim 15, wherein said dye is a fluorescent dye and said surface of said body is viewed under fluoroscigenous light to obtain colored fluorescent traces from the dye in said cracks and flaws.
Claim 19
Dependent Claim
33 words
The method as defined in claim 15, including applying a developer to said surface after removing said remaining dye penetrant from said surface and prior to said viewing the surface of said object.
Claim 20
Dependent Claim
12 words
The method as defined in claim 15, wherein said pyrrolidone is N-methyl-2-pyrrolidone.
Claim 21
Dependent Claim
12 words
The method as defined in claim 19, wherein said pyrrolidone is N-methyl-2-pyrrolidone.
Claim 22
Dependent Claim
33 words
The method as defined in claim 22, said glycol monobutyl ether being present in said dye penetrant composition in an amount of about 20 to about 50 percent by volume of said composition.
Claim 23
Dependent Claim
27 words
The method as defined in claim 15, said dye penetrant composition additionally including a surfactant selected from the group consisting of water soluble and water insoluble surfactants.
Claim 24
Dependent Claim
82 words
The method as defined in claim 23, said pyrrolidone being employed in an amount ranging from about 3 to about 85 percent by volume of said composition, the ratio of said dye to said pyrrolidone ranging from about 1 part of dye to about 25 parts of pyrrolidone, to about 2 parts of said dye to about 1 part of pyrrolidone, by volume, and said composition addiTionally including a surfactant selected from the group consisting of water soluble and water insoluble surfactants.
Claim 25
Dependent Claim
15 words
A method as defined in claim 25, said dye penetrant composition additionally including a ketone.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |