US3564249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse penetrant method and means
Assignee: Boeing North American Inc
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Filing: 1969-02-24
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Granted: 1971-02-16
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Expires: 1989-02-24
Abstract
Abstract In a liquid dye penetrant system, conventional daylight visible bleeding dye penetrant is initially applied to a test surface, and cleaned therefrom leaving residual dye penetrant within cracks and defects. A fluorescing developer coating is applied to the test surface and viewed under ultraviolet light, the solid fluorescing background revealing a nonfluorescing pattern of defects which appears as a black trace wherever residual dye penetrant contacts the developer coating.
Inventors
- 👤 Orlando G Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:23
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
44 words
The method set forth in claim 1 above wherein said dye has a hue within the chromatic spectrum on the low wave length range from about 400 to about 500 millimicrons, or on the high wave length range from about 600 to 695 millimicrons.
Claim 2
Dependent Claim
18 words
The method set forth in claim 1 above, wherein said liquid dye penetrant further comprises an exuding solvent.
Claim 3
Dependent Claim
22 words
The method set forth in claim 1 above, wherein said developer further comprises a resin base paint containing a copolymer of vinyl.
References Cited (Backward Citations)
US2340940A
Cited
US3386920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |