US3926044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed-loop water-washable inspection penetrant process
Assignee: Individual
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Filing: 1974-01-11
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Granted: 1975-12-16
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Expires: 1994-01-11
Abstract
Abstract A closed-loop water-washable inspection penetrant process in which both the penetrant and the wash water are recovered for reuse. A non-surfactant-type low-solubility penetrant which has been applied to test parts is wash-removed, leaving penetrant entrapments in crack defects. The thus-removed penetrant is separated from the wash water partly by skimming off undissolved penetrant, and partly by solvent extraction of dissolved penetrant into a halocarbon solvent. The penetrant-containing halocarbon solvent is distilled to recover both solvent and dissolved penetrant.
Inventors
- 👤 James R Alburger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
IN A WATER-WASHABLE INSPECTION PENETRANT PROCESS IN WHICH A WATER-REMOVABLE DYED LIQUID INSPECTION PENETRANT IS APPLIED TO A TEST SURFACE AND EXCESS SURFACE PENETRANT IS REMOVED BY WASHING SAID TEST SURFACE WITH WATER, LEAVING ENTRAPMENTS OF SAID PENETRANT IN ANY CRACK DEFECTS WHICH ARE PRESENT, AND LEAVING AT LEAST PART OF SAID PENETRANT IN THE FORM OF A SOLUTION IN SAID WASH WATER, THE IMPROVEMENT WHICH PERMITS RECOVERY AND RE-USE OF BOTH THE WASH WATER AND PENETRANT DISSOLVED IN SAID WASH WATER IN WHICH SAID PENETRANT IS A NONSURFACTANT-TYPE LOW-SOLUBILITY COMPOSITION, AND IN WHICH RE-
Claim 2
Dependent Claim
95 words
IN A WATER-WASHABLE INSPECTION PENETRANT PROCESS IN WHICH A WATER-REMOVABLE DYED LIQUID INSPECTION PENETRANT IS APPLIED TO A TEST SURFACE AND EXCESS SURFACE PENETRANT IS REMOVED BY WASHING SAID TEST SURFACE WITH WATER, LEAVING ENTRAPMENTS OF SAID PENETRANT IN ANY CRACK DEFECTS WHICH ARE PRESENT, AND LEAVING AT LEAST PART OF SAID PENETRANT IN THE FORM OF A SOLUTION IN SAID WASH WATER, THE IMPROVEMENT WHICH PERMITS RECOVERY AND RE-USE OF BOTH THE WASH WATER AND PENETRANT DISSOLVED IN SAID WASH WATER IN WHICH SAID PENETRANT IS A NONSURFACTANT-TYPE LOW-SOLUBILITY COMPOSITION, AND IN WHICH RE-
Claim 3
Dependent Claim
28 words
A process in accordance with claim 1 in which said halocarbon solvent is at least one member selected from the group consisting of: 1.1.2.2-Tetrachloroethylene (Perchloroethylene), 1.1.2.2-Tetrachloro-1.2-difluoroethane, and 1.1.2-Trichloro-1.2.2-trifluoroethane.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |