US3753647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid oxygen compatible dye penetrant method for metal defect inspection
Assignee: Boeing North American Inc
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Filing: 1970-03-05
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Granted: 1973-08-21
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Expires: 1990-03-05
Abstract
Abstract A liquid fluorescent dye penetrant containing a high volume concentration of a liquid halocarbon is taught as a very sensitive microdefect detector on metal surfaces. The dye penetrant is insensitive to chemical reaction or detonation with liquid oxygen in a standard impact safety test. The liquid dye penetrant safety factor is important in inspection of metal components later fabricated into rocket motor systems, which use liquid oxygen (LOX) in propellant systems, or the like powerful liquid oxidizers.
Inventors
- 👤 O Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:08
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91; Y; Y10; Y10S; Y10S8/00; Y10S8/907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
The sensitive liquid dye penetrant of claim 1 and further including a nonionic wetting and spreading agent constituting not more than five volume percent of said dye penetrant.
Claim 2
Dependent Claim
15 words
The sensitive liquid dye penetrant of claim 1, wherein said ketone is isobutyl heptyl ketone.
Claim 3
Dependent Claim
31 words
The sensitive liquid dye penetrant of claim 1, wherein said halocarbon solvent is selected from the group consisting of: 1-bromo-1-difluoro-2-bromo-2-difluoro ethane, 1-dichloro-1-fluoro-2 ethane, 1-dichloro-1-fluoro-2-dichloro-2-fluoro ethane, 1,1,1 trichloro ethane, trichloroethylene, and tetrachloroethylene.
Claim 4
Dependent Claim
21 words
The sensitive liquid dye penetrant of claim 1, wherein said nonionic wetting and spreading agent is a nonyl phenyl polyethylene glycol.
Claim 5
Dependent Claim
26 words
The sensitive liquid dye penetrant of claim 1, wherein the volume ratio of halocarbon solvents to the sum of the other components is at least 10:1.
References Cited (Backward Citations)
US3096142A
Cited
US3265461A
Cited
US3386920A
Cited
US3518205A
Cited
US3555071A
Cited
US3561262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |