Patent US3635810A successfully refreshed from Google Patents.
US3635810A
Expired / Lapsed
US
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Electrocoating with desulfated pigments
Assignee: Sherwin Williams Co
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Filing: 1969-09-22
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Granted: 1972-01-18
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Expires: 1989-09-22
Abstract
Abstract Pigments having sulfate impurity are treated with barium hydroxide. Such pigments are useful in producing glossy anodic deposits of pigmented polycarboxylic resins by electrocoating processes. The bath stability over long periods of time can be substantially improved and is valuable in continuous electrocoating processes.
Inventors
- 👤 Garmond G Schurr
- 👤 Bruce M Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:17
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4484
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
The process of claim 1 wherein the pigment contains as its major component particles consisting essentially of titanium dioxide and wherein the pigment contains water-soluble sulfate as an impurity.
Claim 2
Dependent Claim
22 words
The process of claim 2 wherein the pigment is treated with a stoichiometric excess of barium hydroxide solution to precipitate the sulfate.
References Cited (Backward Citations)
US3444064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |