Patent US2164738A successfully refreshed from Google Patents.
Patent US2528469A successfully refreshed from Google Patents.
US2528469A
Expired / Lapsed
US
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Granular polymerization of vinyl chloride
Assignee: Shell Development Co
•
Filing: 1948-02-24
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Granted: 1950-10-31
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Expires: 1968-02-24
Abstract
No abstract record available.
Inventors
- 👤 Fred E Condo
- 👤 Carl W Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:05
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10S; Y10S526/00; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR PRODUCTION OF GRANULAR POLYVINYL CHLORIDE IN AQUEOUS DISPERSION WHEREIN THE FORMED POLYMER VOLUNTARILY SETTLES UPON THE AQUEOUS MIXTURE BECOMING QUIESCENT WHICH COMPRISES AGITATING AND POLYMERIZING DISPERSED LIQUID VINYL CHLORIDE IN AN AQUEOUS MEDIUM AT A TEMPERATURE OF 30*C. TO 60*C., THE REACTION MIXTURE CONTAINING 0.1% TO 3% OF OIL-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND 200% TO 500% OF WATER, EACH PERCENTAGE BEING BASED ON THE WEIGHT OF THE VINYL CHLORIDE, AS WELL AS 0.01% TO 0.09% OF WATER-SOLUBLE SYNTHETIC EMULSIFYING AGENT AND 0.01% TO 0.3% OF WATER-SOLUBLE STABILIZING HYDROPHILIC COLLOID, WHICH LATTER PERCENTAGES ARE BASED ON THE WEIGHT OF THE WATER.
Claim 2
Dependent Claim
103 words
A PROCESS FOR PRODUCTION OF GRANULAR POLYVINYL CHLORIDE IN AQUEOUS DISPERSION WHEREIN THE FORMED POLYMER VOLUNTARILY SETTLES UPON THE AQUEOUS MIXTURE BECOMING QUIESCENT WHICH COMPRISES AGITATING AND POLYMERIZING DISPERSED LIQUID VINYL CHLORIDE IN AN AQUEOUS MEDIUM AT A TEMPERATURE OF 30*C. TO 60*C., THE REACTION MIXTURE CONTAINING 0.1% TO 3% OF OIL-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND 200% TO 500% OF WATER, EACH PERCENTAGE BEING BASED ON THE WEIGHT OF THE VINYL CHLORIDE, AS WELL AS 0.01% TO 0.09% OF WATER-SOLUBLE SYNTHETIC EMULSIFYING AGENT AND 0.01% TO 0.3% OF WATER-SOLUBLE STABILIZING HYDROPHILIC COLLOID, WHICH LATTER PERCENTAGES ARE BASED ON THE WEIGHT OF THE WATER.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |