US3958119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for evaluating penetrants
Assignee: United States Department of the Air Force
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Filing: 1974-08-05
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Granted: 1976-05-18
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Expires: 1994-08-05
Abstract
Abstract A method is provided for evaluating fluorescent penetrants in which a penetrant to be evaluated is applied to a bevelled edge of a laminate of adhesively bonded metal sheets, the edge having shallow, parallel grooves formed therein between the metal sheets. After removal of excess penetrant from the edge, a developer is applied thereto and the edge is exposed to ultraviolet light. By observing the appearance of the bevelled edge, e.g., the brightness of the parallel lines resulting from penetrant being drawn from the grooves through action of the developer, an indication of the efficacy of the penetrant is obtained.
Inventors
- 👤 Toy T. Shigekawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:55
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A method for evaluating the efficiency of liquid penetrants in detecting flaws which comprises applying a penetrant to be evaluated to a bevelled surface of a laminate of adhesively bonded metal sheets, the surface having shallow, parallel grooves formed therein between the metal sheets; removing excess penetrant from the surface while leaving penetrant in the grooves; applying a developer to the surface; and observing the appearance of the surface.
Claim 2
Independent Claim
69 words
A method for evaluating the efficiency of liquid penetrants in detecting flaws which comprises applying a penetrant to be evaluated to a bevelled surface of a laminate of adhesively bonded metal sheets, the surface having shallow, parallel grooves formed therein between the metal sheets; removing excess penetrant from the surface while leaving penetrant in the grooves; applying a developer to the surface; and observing the appearance of the surface.
Claim 3
Dependent Claim
27 words
The method according to claim 1 in which the liquid penetrant is a visible dye penetrant and the appearance of the surface is observed under white light.
Claim 4
Dependent Claim
26 words
The method according to claim 1 in which the liquid penetrant is a fluorescent penetrant and the appearance of the surface is observed under ultraviolet light.
Claim 5
Dependent Claim
26 words
The method according to claim 3 in which the fluorescent penetrant is a water-washable penetrant, and excess penetrant is removed by washing the surface with water.
Claim 6
Dependent Claim
34 words
The method according to claim 3 in which the fluorescent penetrant is a postemulsifiable penetrant, and excess penetrant is removed by contacting the penetrant with an emulsifier and then washing the surface with water.
Claim 7
Independent Claim
84 words
A method for comparing the efficiency of two or more liquid penetrants in detecting flaws which comprises separately applying at least two different penetrants to a corresponding number of separated sections of a bevelled surface of a laminate of adhesively bonded metal sheets, the surface having shallow, parallel grooves formed therein between the metal sheets; removing excess penetrant from the surface while leaving penetrant in the grooves; applying a developer to the surface, and comparing the appearance of the different sections of the surface.
Claim 8
Independent Claim
84 words
A method for comparing the efficiency of two or more liquid penetrants in detecting flaws which comprises separately applying at least two different penetrants to a corresponding number of separated sections of a bevelled surface of a laminate of adhesively bonded metal sheets, the surface having shallow, parallel grooves formed therein between the metal sheets; removing excess penetrant from the surface while leaving penetrant in the grooves; applying a developer to the surface, and comparing the appearance of the different sections of the surface.
Claim 9
Dependent Claim
33 words
The method according to claim 6 in which the liquid penetrants are fluorescent penetrants and the comparison of the appearance of the different sections is made by observing the surface under ultraviolet light.
Claim 10
Dependent Claim
25 words
The method according to claim 7 in which the liquid penetrants are water-washable penetrants, and excess penetrants are removed by washing the surface with water.
Claim 11
Dependent Claim
33 words
The method according to claim 7 in which the liquid penetrants are postemulsifiable penetrants, and excess penetrant is removed by contacting the penetrants with an emulsifier and then washing the surface with water.
References Cited (Backward Citations)
US3506827A
Cited
US3557015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |