Patent US3089071A successfully refreshed from Google Patents.
US3748469A
Expired / Lapsed
US
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Nonaqueous developer composition for penetrant inspection and method for employing same
Assignee: Boeing North American Inc
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Filing: 1972-10-04
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Granted: 1973-07-24
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Expires: 1992-10-04
Abstract
Abstract Wet nonaqueous developer composition for use in penetrant inspection of surface flaws in bodies, consisting essentially of isopropyl alcohol, talc and glycol monobutyl ether (butyl Cellosolve). The resulting wet nonaqueous developer is particularly effective when applied to a surface following application of a penetrant composition, particularly a fluorescent penetrant, to provide bright fluorescent indication of surface flaws from an unusually wide range of size of such flaws and cracks, when inspected under fluorescent illumination.
Inventors
- 👤 O Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:55
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
23 words
A composition as defined in claim 1, said talc being of particle size ranging from about 15 to less than about 1 micron.
Claim 2
Dependent Claim
26 words
A composition as defined in claim 1, employing substantial proportions of said isopropyl alcohol and said talc, and a minor proportion of said glycol monobutyl ether.
Claim 3
Dependent Claim
26 words
A composition as defined in claim 3, said glycol monobutyl ether being present in an amount ranging from about 0.5 tO about 5 percent by weight.
Claim 4
Dependent Claim
44 words
A composition as defined in claim 1, and consisting essentially of about 25 to about 80 percent of said isopropyl alcohol, about 10 to about 70 percent of said talc and about 0.5 to about 5 percent of said glycol monobutyl ether, by weight.
Claim 5
Dependent Claim
23 words
A composition as defined in claim 5, said talc being of particle size ranging from about 15 to less than about 1 micron.
Claim 6
Dependent Claim
44 words
A composition as defined in claim 1, and consisting essentially of about 40 to about 75 percent of said isopropyl alcohol, about 15 to about 50 percent of said talc and about 0.5 to about 3 percent of said glycol monobutyl ether, by weight.
Claim 7
Dependent Claim
23 words
A composition as defined in claim 7, said talc being of particle size ranging from about 15 to less than about 1 micron.
Claim 8
Independent Claim
110 words
A method of detecting surface flaws in the surface of an object which comprises applying to said surface a liquid penetrant comprising a dye and a liquid vehicle for said dye, removing excess liquid penetrant from said surface while leaving liquid penetrant in any cracks therein, applying to said surface a wet nonaqueous developer composition which consists essentially of isopropyl alcohol, talc and glycol monobutyl ether, causing evaporation of said isopropyl alcohol and leaving a substantially dry powder, and inspecting the surface of said body under light which is effective to emit dye smears from said dye drawn into said powder composition adjacent said cracks, to thereby locate said cracks.
Claim 9
Dependent Claim
43 words
A method as defined in claim 9, said talc being of particle size ranging from about 15 to less than about 1 micron, and employing substantial proportions of said isopropyl alcohol and said talc, and a minor proportion of said glycol monobutyl ether.
Claim 10
Dependent Claim
46 words
A process as defined in claim 9, said developer composition consisting essentially of about 25 to about 80 percent of said isopropyl alcohol, about 10 to about 70 percent of said talc and about 0.5 to about 5 percent of said glycol monobutyl ether, by weight.
Claim 11
Dependent Claim
77 words
A method as defined in claim 9, wherein said liquid penetrant contains a fluorescent dye, and said wet nonaqueous developer composition is sprayed on the surface of said body, and following evaporation of said isopropyl alcohol to form said substantially dry powder on said surface, inspecting the surface of said body under fluorescent light to locate any cracks in said surface as indicated by fluorescent emission from said dye drawn into said powder composition adjacent said cracks.
Claim 12
Dependent Claim
23 words
A method as defined in claim 12, wherein said liquid penetrant comprises a fluorescent dye and a stable lactam solvent for said dye.
Claim 13
Dependent Claim
46 words
A process as defined in claim 12, said developer composition consisting essentially of about 25 to about 80 percent of said isopropyl alcohol, about 10 to about 70 percent of said talc and about 0.5 to about 5 percent of said glycol monobutyl ether, by weight.
Claim 14
Dependent Claim
46 words
A method as defined in claim 12, said developer composition consisting essentially of about 40 to about 75 percent of said isopropyl alcohol, about 15 to about 50 percent of said talc and about 0.5 to about 3 percent of said glycol monobutyl ether, by weight.
Claim 15
Dependent Claim
27 words
A method as defined in claim 15, said talc in said developer composition being of particle size ranging from about 15 to less than about 1 micron.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |