Patent US3279243A successfully refreshed from Google Patents.
US3279243A
Expired / Lapsed
US
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Inspection method
Assignee: North American Aviation Corp
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Filing: 1963-01-23
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Granted: 1966-10-18
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Expires: 1983-01-23
Abstract
No abstract record available.
Inventors
- 👤 Orlando G Molina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:20
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A METHOD OF OBTAINING A PATTERN OF SURFACING DISCONTINUITIES IN A SPECIMEN, SAID METHOD COMPRISING: APPLYING TO SAID SPECIMEN SURFACE A RELATIVELY QUICK-DRYING LIQUID PENETRANT COMPRISING A RAPIDLY EVAPORATING SOLVENT CONTAINING A BLEEDING DYE, REMOVING EXCESS PENETRANT FROM SAID SURFACE WHILE SOME OF SAID DYE IN A SUBSTANTIALLY DRY STATE REMAINS IN SAID SURFACE DISCONTINUITIES, AND THEREAFTER APPLYING TO SAID SURFACE AT LEAST ONE COATING OF A RELATIVELY QUICK-DRYING DEVELOPER COMPRISING A WETTING AGENT AND A PLASTIC MEDIUM, SAID DRY DYE BEING ADAPTED TO BE WETTED BY SAID WETTING AGENT AND BLEED INTO SAID PLASTIC MEDIUM TO THE SURFACE OF SAID COATING WHILE SAID DEVELOPER REMAINS SUBSTANTIALLY IN THE MOIST STATE, SAID DYE BEING FURTHER ADAPTED TO TERMINATE SAID BLEEDING WHEN SAID DEVELOPER BECOMES SUBSTANTIALLY DRY, WHEREBY A STRAIN PATTERN PRODUCED IN SAID DEVELOPER PRECISELY RECORDING SAID SURFACE DISCONTINUITIES IS PERMANENTLY FIXED IN SIZE AND LOCATION UPON DRYING OF SAID DEVELOPER.
Claim 2
Independent Claim
151 words
A METHOD OF OBTAINING A PATTERN OF SURFACING DISCONTINUITIES IN A SPECIMEN, SAID METHOD COMPRISING: APPLYING TO SAID SPECIMEN SURFACE A RELATIVELY QUICK-DRYING LIQUID PENETRANT COMPRISING A RAPIDLY EVAPORATING SOLVENT CONTAINING A BLEEDING DYE, REMOVING EXCESS PENETRANT FROM SAID SURFACE WHILE SOME OF SAID DYE IN A SUBSTANTIALLY DRY STATE REMAINS IN SAID SURFACE DISCONTINUITIES, AND THEREAFTER APPLYING TO SAID SURFACE AT LEAST ONE COATING OF A RELATIVELY QUICK-DRYING DEVELOPER COMPRISING A WETTING AGENT AND A PLASTIC MEDIUM, SAID DRY DYE BEING ADAPTED TO BE WETTED BY SAID WETTING AGENT AND BLEED INTO SAID PLASTIC MEDIUM TO THE SURFACE OF SAID COATING WHILE SAID DEVELOPER REMAINS SUBSTANTIALLY IN THE MOIST STATE, SAID DYE BEING FURTHER ADAPTED TO TERMINATE SAID BLEEDING WHEN SAID DEVELOPER BECOMES SUBSTANTIALLY DRY, WHEREBY A STRAIN PATTERN PRODUCED IN SAID DEVELOPER PRECISELY RECORDING SAID SURFACE DISCONTINUITIES IS PERMANENTLY FIXED IN SIZE AND LOCATION UPON DRYING OF SAID DEVELOPER.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |