Microporous vinyl chloride polymers and process for producing
Abstract
Abstract THIS DISCLOSURE RELATES TO A NOVEL PROCESS AND TO NOVEL PRODUCTS. THE PRODUCTS COMPRISE A VINYL CHLORIDE POLYMER HAVING AN IMPROVED MICRORETICULATED STRUCTURE AND ARE MADE BY A PROCESS WHICH COMPRISES FORMING A DISPERSION OF VINYL CHLORIDE POLYMER PARTICLES IN WATER CONTAINING A WATER-SOLUBLE THICKENING AGENT, PREFERABLY DEAERATING THE DISPERSION UNDER REDUCED PRESSURE AND HEATING OF THE DISPERSION TO SINTER THE VINYL CHLORIDE POLYMER PARTICLES AND TO FORM A MICRORETICULATED, MICROPOROUS STRUCTURE. THE PRODUCTS OF THIS INVENTION ARE PARTICULARLY USEFUL AS FILTER MATERIALS, ESPECIALLY AS CIGARETTE FILTERS; AND THE PROCESS OF THE INVENTION IS ESPECIALLY SUITED FOR THE FORMATION OF SHAPED POROUS ARTICLES WHICH ARE USEFUL AS FILTERS.
Inventors
- 👤 W Johnson
- 👤 L Davis
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |