US3578484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface preparation and electrostatic spray coating of plastic article
Assignee: Dow Chemical Co
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Filing: 1969-02-13
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Granted: 1971-05-11
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Expires: 1989-02-13
Abstract
Abstract PROCESS FOR THE SPRAY COATING OF PLASTIC ARTICLES WHEREIN THE ARTICLES ARE SURFACE SULFONATED BEFORE THEY ARE ELECTROSTATIC SPRAY COATED. THE ARTICLES CAN BE NEUTRALIZED AFTER SULFONATION IF DESIRED. A DEGREE OF SULFONATION OF AT LEAST ABOUT 0.001 MILLIGRAM SULFUR TRIOXIDE OR EQUIVALENTS THEREOF PER SQUARE CENTIMETER OF PLASTIC SURFACE IS REQUIRED TO GIVE THE DESIRED UNIFORM COATING AND GOOD ADHESION. THE SPRAYED COATINGS CAN BE LIQUID PAINTS OR LACQUERS, POWDERED PLASTICS AND LIQUID COATINGS CONTAINING FILAMENTARY REINFORCING AGENTS WHICH ARE NORMALLY CURED BY DRY ING, HEATING AND DRYING, OR HEATING.
Inventors
- 👤 Wilhelm E Walles
- 👤 Arnett L Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/002; B05D3/005; B05D1/00; B05D1/02; B05D1/04; B05D1/045; B05D2201/00
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |