US2902348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing material
Assignee: Allied Res Products Inc
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Filing: 1955-08-03
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Granted: 1959-09-01
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Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 Charles W Ostrander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:18
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS OF DETECTING THE PRESENCE OR ABSENCE OF A CHROMATE CONVERSION COATING ON A METAL COMPRISING APPLYING TO SAID COATED METAL A DROP OF A SOLUTION IN WATER OF A WATER-SOLUBLE FERRIC SALT AND A WATER-SOLUBLE FERRICYANIDE AND CONTAINING SUFFICIENT ACID TO GIVE A PH OF 0.1 TO 3.0, SAID SOLUTION BEING OF AMBER COLOR AND THE LACK OF OR PRESNECE OF A CHROMATE CONVERSION COATING BEING INDICATED BY THE LENGTH OF TIME TAKEN FOR THE AMBER TEST SOLUTION TO TURN A BLUE-GREEN COLOR WHEN CONTACTED WITH THE METAL COATED SURFACE.
Claim 2
Dependent Claim
92 words
A PROCESS OF DETECTING THE PRESENCE OR ABSENCE OF A CHROMATE CONVERSION COATING ON A METAL COMPRISING APPLYING TO SAID COATED METAL A DROP OF A SOLUTION IN WATER OF A WATER-SOLUBLE FERRIC SALT AND A WATER-SOLUBLE FERRICYANIDE AND CONTAINING SUFFICIENT ACID TO GIVE A PH OF 0.1 TO 3.0, SAID SOLUTION BEING OF AMBER COLOR AND THE LACK OF OR PRESNECE OF A CHROMATE CONVERSION COATING BEING INDICATED BY THE LENGTH OF TIME TAKEN FOR THE AMBER TEST SOLUTION TO TURN A BLUE-GREEN COLOR WHEN CONTACTED WITH THE METAL COATED SURFACE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |