US3922545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for nondestructively testing with a desensitized silver halide radiographic layer
Assignee: Eastman Kodak Co
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Filing: 1974-02-26
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Granted: 1975-11-25
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Expires: 1994-02-26
Abstract
Abstract A method is disclosed of nondestructively testing an article for substantially invisible voids adjacent its surface. A radioactive gas is brought into contact with the surface of the article to be tested. It is retained by adsorption on those surfaces presented by the substantially invisible voids and at other surface locations. A silver halide radiographic layer is juxtaposed adjacent the surface being tested, and the location of the radioactive gas adsorbed within the substantially invisible voids is preferentially recorded within the silver halide radiographic layer.
Inventors
- 👤 Carl B Gibbons
- 👤 Martha H Sewell
- 👤 Robert C Taber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/04; G01N23/06; G01N23/083; G01N23/18; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/36
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
87 words
A METHOD OF NONDESTRUCTIVELY TESTING AN ARTICLE FOR SUBSTANTIALLY INVISIBLE VOIDS ADJACENT ITS SURFACE COMPRISING: A. BRINGING A RADIOACTIVE GAS INTO CONTACT WITH THE SURFACE OF THE ARTICLE BEING TESTED, B. RETAINING BY ADSORPTION THE RADIOACTIVE GAS ON THOSE SURFACES PRESENTED BY THE SUBSTANTIALLY INVISIBLE VOIDS AND AT OTHER LOCATIONS ADJACENT THE SURFACE, C. JUXTAPOSING A SILVER HALIDE RADIOGRAPHIC LAYER ADJACENT THE SURFACE BEING TESTED, AND D. PREFERENTIALLY RECORDING WITHIN THE SILVER HALIDE RADIOGRAPHIC LAYER THE LOCATION OF THE RADIOACTIVE GAS ADSORBED WITHIN THE SUBSTANTIALLY INVISIBLE VOIDS.
Claim 2
Independent Claim
87 words
A METHOD OF NONDESTRUCTIVELY TESTING AN ARTICLE FOR SUBSTANTIALLY INVISIBLE VOIDS ADJACENT ITS SURFACE COMPRISING: A. BRINGING A RADIOACTIVE GAS INTO CONTACT WITH THE SURFACE OF THE ARTICLE BEING TESTED, B. RETAINING BY ADSORPTION THE RADIOACTIVE GAS ON THOSE SURFACES PRESENTED BY THE SUBSTANTIALLY INVISIBLE VOIDS AND AT OTHER LOCATIONS ADJACENT THE SURFACE, C. JUXTAPOSING A SILVER HALIDE RADIOGRAPHIC LAYER ADJACENT THE SURFACE BEING TESTED, AND D. PREFERENTIALLY RECORDING WITHIN THE SILVER HALIDE RADIOGRAPHIC LAYER THE LOCATION OF THE RADIOACTIVE GAS ADSORBED WITHIN THE SUBSTANTIALLY INVISIBLE VOIDS.
Claim 3
Dependent Claim
31 words
A method of nondestructively testing according to claim 1 in which a sealant composition is applied to the article surface to retain the adsorbed radioactive gas adjacent the substantially invisible voids.
Claim 4
Dependent Claim
20 words
A method of nondestructively testing according to claim 2 in which the silver halide radiographic layer forms the sealant composition.
Claim 5
Dependent Claim
31 words
A method of nondestructively testing according to claim 2 in which a separate, nonimaging sealant layer is applied before the silver halide radiographic layer is juxtaposed adjacent the surface being tested.
Claim 6
Dependent Claim
27 words
A method of nondestructively testing according to claim 2 in which the sealant composition is applied as a uniform coating to the article surface by chill setting.
Claim 7
Independent Claim
111 words
A method of nondestructively testing an article for substantially invisible voids adjacent its surface in which the article has on its surface contaminants providing sites for gas retention comprising: a. bringing a radioactive gas capable of generating high energy emissions into contact with the surface of the article being tested, b. retaining by adsorption the radioactive gas on those surfaces presented by the substantially invisible voids and at the surface retention sites, c. juxtaposing a silver halide radiographic layer desensitized to high energy radiation adjacent the surface being tested, and d. preferenTially recording within the silver halide radiographic layer the location of the radioactive gas adsorbed within the substantially invisible voids.
Claim 8
Independent Claim
111 words
A method of nondestructively testing an article for substantially invisible voids adjacent its surface in which the article has on its surface contaminants providing sites for gas retention comprising: a. bringing a radioactive gas capable of generating high energy emissions into contact with the surface of the article being tested, b. retaining by adsorption the radioactive gas on those surfaces presented by the substantially invisible voids and at the surface retention sites, c. juxtaposing a silver halide radiographic layer desensitized to high energy radiation adjacent the surface being tested, and d. preferenTially recording within the silver halide radiographic layer the location of the radioactive gas adsorbed within the substantially invisible voids.
Claim 9
Dependent Claim
38 words
A method of nondestructively testing according to claim 6 in which the silver halide is desensitized with at least one compound chosen from the class consisting of a piazine, thiuram disulfide, nitro-1,2,3-benzothiazole, nitron, nitroindazole or 5-mercapto tetrazole desensitizer.
Claim 10
Dependent Claim
25 words
A method of nondestructively testing according to claim 7 in which the silver halide is desensitized with a piazine and a thiuram disulfide in combination.
Claim 11
Dependent Claim
19 words
A method of nondestructively testing according to claim 7 in which the silver halide is desensitized with a 5-nitroindazole.
Claim 12
Dependent Claim
20 words
A method of nondestructively testing according to claim 7 in which the silver halide is desensitized with a 1-phenyl-5-mercapto tetrazole.
Claim 13
Dependent Claim
19 words
A method of nondestructively testing according to claim 6 in which the silver halide is desensitized to room light.
Claim 14
Dependent Claim
22 words
A method of nondestructively testing according to claim 6 in which the silver halide is desensitized to high and low energy radiation.
Claim 15
Dependent Claim
16 words
A method of nondestructively testing according to claim 6 in which the radioactive gas is krypton.
Claim 16
Independent Claim
124 words
A method of nondestructively testing an article for substantially invisible voids adjacent its surface comprising: a. bringing a radioactive gas which produces predominantly emissions of high energy into contact with the surface of the article being tested, b. retaining by adsorption the radioactive gas on those surfaces presented by the substantially invisible voids and at other locations adjacent the surface, c. juxtaposing adjacent the surface being tested a silver halide radiographic layer which is sensitive to X-ray radiation and which has been selectively desensitized to the high energy emissions, d. bombarding the surface of the substantially invisible voids with high energy radiation to stimulate X-ray emissions from these surfaces, and e. preferentially recording within the silver halide radiographic layer the sites of X-ray radiation.
Claim 17
Independent Claim
124 words
A method of nondestructively testing an article for substantially invisible voids adjacent its surface comprising: a. bringing a radioactive gas which produces predominantly emissions of high energy into contact with the surface of the article being tested, b. retaining by adsorption the radioactive gas on those surfaces presented by the substantially invisible voids and at other locations adjacent the surface, c. juxtaposing adjacent the surface being tested a silver halide radiographic layer which is sensitive to X-ray radiation and which has been selectively desensitized to the high energy emissions, d. bombarding the surface of the substantially invisible voids with high energy radiation to stimulate X-ray emissions from these surfaces, and e. preferentially recording within the silver halide radiographic layer the sites of X-ray radiation.
Claim 18
Dependent Claim
20 words
A method of nondestructively testing according to claim 14 in which the radioactive gas produces predominantly alpha or beta radiation.
Claim 19
Dependent Claim
36 words
A method of nondestructively testing according to claim 14 in which the silver halide radiographic layer contains a pigment chosen to provide a ready visual contrast with a silver image resulting from the substantially invisible voids.
Claim 20
Dependent Claim
20 words
A method of nondestructively testing according to claim 16 in which the silver halide radiographic layer contains a white pigment.
Claim 21
Dependent Claim
17 words
A method of nondestructively testing according to claim 17 in which the white pigment is titanium dioxide.
Claim 22
Dependent Claim
20 words
A method of nondestructively testing according to claim 14 in which the silver halide radiographic layer contains a thickening agent.
Claim 23
Independent Claim
159 words
A method of nondestructively testing an article for substantially invisible voids adjacent its surface comprising: a. bringing a radioactive krypton gas into contact with the surface of the article being tested, b. sorbing the radioactive krypton gas onto all the surfaces presented by the article surface being tested, c. allowing a portion of the radioactive krypton gas to diffuse from the surfaces of the article, d. coating the surface of the article being tested with a silver halide dispersion which is sensitive to X-ray radiation and which has been desensitized to high energy beta radiation and to room light and which contains a thickening agent and a white pigment, e. allowing the coating to remain on the article surface undisturbed until a latent image of the surface adjacent voids has formed therein, and f. thereafter processing the silver halide dispersion coating to convert the latent image to a permanent, enlarged visible image of the substantially invisible surface adjacent voids.
Claim 24
Independent Claim
159 words
A method of nondestructively testing an article for substantially invisible voids adjacent its surface comprising: a. bringing a radioactive krypton gas into contact with the surface of the article being tested, b. sorbing the radioactive krypton gas onto all the surfaces presented by the article surface being tested, c. allowing a portion of the radioactive krypton gas to diffuse from the surfaces of the article, d. coating the surface of the article being tested with a silver halide dispersion which is sensitive to X-ray radiation and which has been desensitized to high energy beta radiation and to room light and which contains a thickening agent and a white pigment, e. allowing the coating to remain on the article surface undisturbed until a latent image of the surface adjacent voids has formed therein, and f. thereafter processing the silver halide dispersion coating to convert the latent image to a permanent, enlarged visible image of the substantially invisible surface adjacent voids.
References Cited (Backward Citations)
US3179806A
Cited
US3299269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |