US2920203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent penetrant inspection materials and methods
Assignee: Switzer Brothers Inc
•
Filing: 1955-09-21
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Granted: 1960-01-05
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Expires: 1975-09-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Switzer
- 👤 Jr Donald W Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:18
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91; Y; Y10; Y10S; Y10S252/00; Y10S252/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PENETRANT COMPOSITION FOR USE IN FLUORESCENT PENETRANT INSPECTION METHODS FOR LOCATING FLAWS IN TEST BODIES CONSISTING ESSENTIALLY OF A FLOW PENETRATING LIQUID VEHICLE AND A PLURALITY OF FLUORESCENT DYES MUTUALLY DISSOLVED IN SAID VEHICLE, SAID DYES HAVING EMISSIVE AND ABSORPTIVE SPECTRA ESTABLISHING A CASCADING RELATIONSHIP BETWEEN THE DYES WHEREIN LIGHT ENERGY EMITTED BY A CASCADING DYE PEAKS WITHIN THE ABSORPTION RANGE OF A CASCADE DYE AND LIGHT ENERGY EMITTED BY THE CASCADED DYE PEAKS AT A BAND OF LONGER WAVE LENGTH THAN THE BAND IN WHICH THE CASCADING DYE PEAKS, SAID CASCADING DYE BEING SUBSTANTIALLY NON-ABSORPTIVE OF LIGHT OF THE WAVE BAND OF THE EMMISSION PEAK OF THE CASCADED DYE AND THE EMMISSION PEAK OF THE CASCADED DYE BEING IN THE VISIBLE SPECTRUM.
Claim 2
Dependent Claim
124 words
A PENETRANT COMPOSITION FOR USE IN FLUORESCENT PENETRANT INSPECTION METHODS FOR LOCATING FLAWS IN TEST BODIES CONSISTING ESSENTIALLY OF A FLOW PENETRATING LIQUID VEHICLE AND A PLURALITY OF FLUORESCENT DYES MUTUALLY DISSOLVED IN SAID VEHICLE, SAID DYES HAVING EMISSIVE AND ABSORPTIVE SPECTRA ESTABLISHING A CASCADING RELATIONSHIP BETWEEN THE DYES WHEREIN LIGHT ENERGY EMITTED BY A CASCADING DYE PEAKS WITHIN THE ABSORPTION RANGE OF A CASCADE DYE AND LIGHT ENERGY EMITTED BY THE CASCADED DYE PEAKS AT A BAND OF LONGER WAVE LENGTH THAN THE BAND IN WHICH THE CASCADING DYE PEAKS, SAID CASCADING DYE BEING SUBSTANTIALLY NON-ABSORPTIVE OF LIGHT OF THE WAVE BAND OF THE EMMISSION PEAK OF THE CASCADED DYE AND THE EMMISSION PEAK OF THE CASCADED DYE BEING IN THE VISIBLE SPECTRUM.
References Cited (Backward Citations)
US2071471A
Cited
US2227070A
Cited
US2405078A
Cited
US2478951A
Cited
US2476619A
Cited
US2707236A
Cited
US2635329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |