Patent US3589993A successfully refreshed from Google Patents.
US3589993A
Expired / Lapsed
US
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Electropainting process
Assignee: PPG Industries Inc
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Filing: 1968-11-14
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Granted: 1971-06-29
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Expires: 1988-11-14
Abstract
Abstract WHEN A MIXTURE OF DISSIMILAR PIGMENTS ARE EMPLOYED IN AN AQUEOUS COMPOSITION, FOR EXAMPLE, AN ELECTRODEPOSITION BATH, PIGMENT SEPARATION IS FREQUENTLY NOTED. IT HAS NOW BEEN FOUND THAT BY PREPARING TWO AQUEOUS PIGMENT PORTIONS SUCH AS (A) A PIGMENT, AN ANION-ACTIVE AGENT, AND A SOLUBLE SILICATE; AND (B) A PIGMENT, A CATION-ACTIVE AGENT, AND A SOLUBLE METAL SALT CAPABLE OF FORMING AN INSOLUBLE SILICATE AND THEN MIXING (A) AND (B), THEREAFTER FORMING A CONVENTIONAL PIGMENT, THIS PROBLEM IS REDUCED OR ELIMINATED. THE PIGMENTS PREPARED IN THIS MANNER MAY BE USED AS PIGMENTS IN ELECTRODEPOSITABLE COMPOSITIONS.
Inventors
- 👤 Donald J Voskuil
- 👤 John P Knudtson
- 👤 Myron J Krupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:03
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/448
Claims Analysis
Total Claims: 0
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |