US3640922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable aqueous dispersions
Assignee: Dow Chemical Co
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Filing: 1969-04-03
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Granted: 1972-02-08
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Expires: 1989-04-03
Abstract
Abstract AQUEOUS COLLOIDAL DISPERSIONS HAVING IMPROVED STABILITY ARE PREPARED BY ADSORBING A POLYMERIZABLE SURFACTANT, SUCH AS SODIUM ALLYL A-SULFOPALMITATE, ON THE SURFACE OF PARTICLES DISPERSED IN AQUEOUS MEDIA, SUCH AS IN A PREFORMED LATEX, AND POLYMERIZING IN PLACE THE ADSORBED SURFACTANT. ORDINARILY AN AMOUNT OF POLYMERIZABLE SURFACTANT TO PROVIDE FROM ABOUT 50 PERCENT TO ABOUT 100 PERCENT COVERAGE OF THE PARTICLES IS USED.
Inventors
- 👤 David P Sheetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:08
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |