US3766151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel terpolymer containing styrene acrylonitrile and another acrylicmaterial
Assignee: Westvaco Corp
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Filing: 1971-01-13
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Granted: 1973-10-16
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Expires: 1991-01-13
Abstract
Abstract A TERPOLYMER COMPRISING A MAJOR AMOUNT OF STYRENE, AND MINOR AMOUNTS OF ACRYLONITRILE AND ANOTHER ACRYLIC MATERIAL SUCH AS ACRYLAMIDE, ACRYLIC ACID OR METHACRYLIC ACID IS DISCLOSED, WHICH HAS UTILITY AS AN ORGANIC PIGMENT IN PAPER COATING COMPOSITIONS. A STABLE AQUEOUS EMULSION OF THE TERPOLYMER IS PREPARED WITHOUT THE NEED FOR COMVENTIONAL PROTECTIVE COLLOIDS BY THE PROPER CHOICE OF EMULSIFIERS AND TEMPERATURE DURING AN EMULSION POLYMERIZATION PROCESS. THE AVERAGE PARTICLE SIZE OF THE TERPOLYMERS PRODUCED RANGES FROM ABOUT 0.1 TO ABOUT 0.2 MICRON.
Inventors
- 👤 D Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:27
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/42; C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |