US4233720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming and ultrasonic testing articles of near net shape from powder metal
Assignee: Dow Chemical Co
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Filing: 1978-11-30
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Granted: 1980-11-18
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Expires: 1998-11-30
Abstract
Abstract A method for sonic testing powder metal articles made by hot isostatic pressing in a thick-walled container including the steps of preparing the composite thick-walled container and article for sonic testing by machining sonic surfaces in the exterior surface of the thick-walled container and thereafter sonic testing the article through the walls of the container.
Inventors
- 👤 Walter J. Rozmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; B22F3/156; B22F3/1208; B22F3/24; G; G01; G01N; G01N29/00; G01N29/04; G01N29/11; B22F2998/00; G01N2291/00; G01N2291/02; G01N2291/024; G01N2291/02458; G01N2291/04; G01N2291/044
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A method of forming and sonic testing powder metal articles comprising the steps of producing a thick-walled container by forming a cavity of predetermined complex shape in a mass of suitable container material such that the walls of the container are of sufficient thickness so that the exterior surface thereof does not closely follow the contour of the cavity, cleaning the cavity to remove contaminants, filling the cavity with powder metal and sealing the container, applying heat and pressure to the container to consolidate the powder metal to produce a densified compact, preparing the densified compact for sonic testing by selectively removing portions of the container to form sonic surfaces on the jacket of container material around the densified compact, sonic testing the densified compact and completing removal of the container material.
Claim 2
Independent Claim
132 words
A method of forming and sonic testing powder metal articles comprising the steps of producing a thick-walled container by forming a cavity of predetermined complex shape in a mass of suitable container material such that the walls of the container are of sufficient thickness so that the exterior surface thereof does not closely follow the contour of the cavity, cleaning the cavity to remove contaminants, filling the cavity with powder metal and sealing the container, applying heat and pressure to the container to consolidate the powder metal to produce a densified compact, preparing the densified compact for sonic testing by selectively removing portions of the container to form sonic surfaces on the jacket of container material around the densified compact, sonic testing the densified compact and completing removal of the container material.
Claim 3
Independent Claim
56 words
A method of sonic testing articles of powder metal made by hot isostatic pressing in a thick-walled container comprising the steps of preparing the composite thick-walled container and article for sonic testing by machining sonic surfaces in the exterior surface of the thick-walled container and thereafter sonic testing the article through the walls of the container.
Claim 4
Independent Claim
56 words
A method of sonic testing articles of powder metal made by hot isostatic pressing in a thick-walled container comprising the steps of preparing the composite thick-walled container and article for sonic testing by machining sonic surfaces in the exterior surface of the thick-walled container and thereafter sonic testing the article through the walls of the container.
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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |