Patent US2812318A successfully refreshed from Google Patents.
US2812318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for granular polymerization of vinyl chloride
Assignee: Goodrich Corp
•
Filing: 1955-10-06
•
Granted: 1957-11-05
•
Expires: 1975-10-06
Abstract
No abstract record available.
Inventors
- 👤 Richard M Kreager
- 👤 Edward J Leeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:08
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN THE PROCESS FOR PRODUCING GRANULAR POLYMERS OF VINYL CHLORIDE HAVING SUBSTANTIALLY UNIFORM PARTICLE SIZE WHICH COMPRISES AGITATING AND POLYMERIZING DISPERSED LIQUID VINYL CHLORIDE IN AN AQUEOUS ALCOHOL MEDIUM CONTAINING AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL ALCOHOL IN THE PRESENCE OF A SMALL AMOUNT OF AN ORGANIC PEROXIDE POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF ABOUT 0.05 TO 0.5 WEIGHT PART PER 100 WEIGHT PARTS OF MONOMER, OF A POLYVINYL ESTER HYDROLYZED TO A DEGREE BETWEEN ABOUT 25 AND 65%.
Claim 2
Dependent Claim
91 words
IN THE PROCESS FOR PRODUCING GRANULAR POLYMERS OF VINYL CHLORIDE HAVING SUBSTANTIALLY UNIFORM PARTICLE SIZE WHICH COMPRISES AGITATING AND POLYMERIZING DISPERSED LIQUID VINYL CHLORIDE IN AN AQUEOUS ALCOHOL MEDIUM CONTAINING AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL ALCOHOL IN THE PRESENCE OF A SMALL AMOUNT OF AN ORGANIC PEROXIDE POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION IN THE PRESENCE OF ABOUT 0.05 TO 0.5 WEIGHT PART PER 100 WEIGHT PARTS OF MONOMER, OF A POLYVINYL ESTER HYDROLYZED TO A DEGREE BETWEEN ABOUT 25 AND 65%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |