US3816565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle size control of bulk polymerized vinyl chloride polymers and copolymers
Assignee: Hooker Chemical Corp
•
Filing: 1972-05-08
•
Granted: 1974-06-11
•
Expires: 1992-05-08
Abstract
Abstract IN A PROCESS OF BULK POLYMERIZATION INVOLVING TWO-STAGE POLYMERIZATION WHEREIN HIGH SPEED AGITATION IS USED DRUING THE FIRST STAGE AND SLOW SPEED AGITATION IS USED IN THE SECOND STAGE, THE POLYMERIZATION IN THE FIRST STAGE IS CONDUCTED IN CONTACT WITH AN N-VINYL PYRROLIDONE TO PRODUCE SMALL PARTICLES SIZE POLYVINYL CHLORIDE HOMOJPOLYMERS OR COPOLYMERS USEFUL AS EXTENDER RESINS IN PLASTISOLS, WHICH ARE USED TO PRODUCE PROTECTIVE, DECORATIVE, AND ADHESIVE COATINGS.
Inventors
- 👤 A Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:34
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |