US4302678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent standard for scanning devices
Assignee: Illinois Tool Works Inc
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Filing: 1980-01-25
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Granted: 1981-11-24
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Expires: 2000-01-25
Abstract
Abstract A standard specimen for calibrating an ultraviolet scanning system of the type used to detect surface flaws in workpieces by penetrant testing including a piece of glass which has the characteristic of emitting fluorescent radiation upon excitation by ultraviolet light, and a heat conductive carrier element rigidly supporting the piece of glass therein. The standard specimen provides a means for confirming instrumentation stability despite changes in temperature.
Inventors
- 👤 Phillip W. Schiffert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:06
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91; G01N21/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A standard specimen for calibrating an ultraviolet scanning system comprising: a piece of borosilicate glass containing uranium oxide and having the characteristic of emitting fluorescent radiation upon excitation by ultraviolet light, and a heat conductive carrier element rigidly supporting and encasing said piece of glass therein while leaving at least one surface of said glass exposed to ultraviolet radiation, said one surface being flush with a planar surface of said carrier element into which it extends.
Claim 2
Dependent Claim
76 words
A standard specimen for calibrating an ultraviolet scanning system comprising: a piece of borosilicate glass containing uranium oxide and having the characteristic of emitting fluorescent radiation upon excitation by ultraviolet light, and a heat conductive carrier element rigidly supporting and encasing said piece of glass therein while leaving at least one surface of said glass exposed to ultraviolet radiation, said one surface being flush with a planar surface of said carrier element into which it extends.
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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |