US4643978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for detecting phosphorus segregates in metallic material
Assignee: JFE Steel Corp
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Filing: 1984-11-13
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Granted: 1987-02-17
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Expires: 2004-11-13
Abstract
Abstract An aqueous solution of silver nitrate is effective to detect phosphorus segregates in a metallic material, particularly cast steel. Segregated phosphorus can be detected by etching a surface of steel to be tested, attaching test paper onto the steel surface, applying an aqueous solution of 0.1 to 80% by weight of silver nitrate to the paper, maintaining the paper in contact with the steel surface for a sufficient time, removing the paper from the steel surface, and subjecting the paper to fixing treatment.
Inventors
- 👤 Yoshiko Funahashi
- 👤 Yoshikazu Kamino
- 👤 Yasuharu Matsumura
- 👤 Senichi Harimaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:30
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/221; G01N33/00; G01N33/20; G01N33/202; G01N33/2022; Y; Y10; Y10T; Y10T436/00; Y10T436/16; Y10T436/19; Y10T436/193333; Y10T436/25; Y10T436/25125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A method for detecting phosphorus segregates in a metallic material, comprising the steps of (a) attaching a test sheet onto a surface of a said metallic material to be tested, (b) maintaining the sheet in contact with the metallic material surface in the presence of an aqueous solution comprising 0.1 to 80% by weight of silver nitrate for a sufficient time, and (c) removing the sheet from the metallic material surface, whereby the said test sheet will display a pattern of reduced silver ions corresponding to the phosphorus segregates on said surface.
Claim 2
Independent Claim
92 words
A method for detecting phosphorus segregates in a metallic material, comprising the steps of (a) attaching a test sheet onto a surface of a said metallic material to be tested, (b) maintaining the sheet in contact with the metallic material surface in the presence of an aqueous solution comprising 0.1 to 80% by weight of silver nitrate for a sufficient time, and (c) removing the sheet from the metallic material surface, whereby the said test sheet will display a pattern of reduced silver ions corresponding to the phosphorus segregates on said surface.
Claim 3
Dependent Claim
14 words
The method according to claim 1 wherein the silver nitrate solution comprises an alcohol.
Claim 4
Dependent Claim
21 words
The method according to claim 1 and further comprising; (d) subjecting the sheet to a fixing treatment after said removing step.
Claim 5
Dependent Claim
33 words
The method according to claim 1 wherein said maintaining step comprises (b-1) applying said aqueous silver nitrate solution to the sheet and (b-2) maintaining the sheet in contact with the metallic material surface.
Claim 6
Dependent Claim
42 words
The method according to claim 1 wherein the test sheet has silver nitrate born therein in a dry state and said maintaining step comprises (b-1) applying water to the sheet and (b-2) maintaining the sheet in contact with the metallic material surface.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |