US3704370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiographic inspection technique
Assignee: United States Department of the Air Force
•
Filing: 1971-04-09
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Granted: 1972-11-28
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Expires: 1991-04-09
Abstract
Abstract A contrast enhancement technique for use in radiography involves impregnating material to be inspected by nondestructive radiographic techniques with a tetrabromoethane prior to carrying out the actual radiographic inspection and then removing the tetrabromoethane.
Inventors
- 👤 William L Shelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:59
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/18; G01N23/083; G03; G03B; G03B42/00; G03B42/02; G03B42/028
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
21 words
A method according to claim 1 wherein the article is contacted with the tetrabromoethane by immersing said article in the tetrabromoethane.
Claim 2
Dependent Claim
3 words
X-raying the article.
Claim 3
Dependent Claim
18 words
A method according to claim 2 wherein said immersion is carried out for about 6 to 10 hours.
Claim 4
Dependent Claim
11 words
A method according to claim 1 wherein the tetrabromoethane is 1,1,2,2-tetrabromoethane.
Claim 5
Dependent Claim
50 words
A method according to claim 4 wherein said 1,1,2,2-tetrabromoethane is removed, after the article is X-rayed, by heating the impregnated article to a temperature in the range of from about 90*C to about 130*C under a pressure of from about 4 mm of mercury to about 15 mm of mercury.
Claim 6
Dependent Claim
14 words
A method according to claim 5 wherein said article is a rocket nozzle insert.
Claim 7
Dependent Claim
13 words
A method according to claim 6 wherein said insert is a multidirectional insert.
Claim 8
Dependent Claim
14 words
A method according to claim 5 wherein said article is a rocket nose tip.
References Cited (Backward Citations)
US2916623A
Cited
US3316407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |