US3111508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinyl esters and polyvinyl alcohol
Assignee: Kurashiki Rayon Co Ltd
•
Filing: 1959-10-07
•
Granted: 1963-11-19
•
Expires: 1979-10-07
Abstract
No abstract record available.
Inventors
- 👤 Imai Kiyokazu
- 👤 Maeda Unpei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; C; C08; C08F; C08F118/00; C08F118/02; C08F118/04; C08F118/08; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A PROCESS FOR PREPARING POLYVINYL ACETATE WHICH IS CONVERTIBLE BY ALKALINE ALCOHOLYSIS TO POLYVINYL ALCOHOL WHICH SHOWS ALMOST NO TENDENCY TO GEL IN AQUEOUS SOLUTION, WHICH COMPRISES HOMOPOLYMERIZING VINYL ACETATE IN THE PRESENCE OF A FREE RADICAL INITIATOR AND IN 15 TO 85 PARTS BY WEIGHT OF A SOLVENT, BASED ON THE COMBINED WEIGHT OF MONOMER AND SOLVENT, SELECTED FROM THE GROUP CONSISTING OF ETHYLENE CARBONATE AND SATURATED LOWER ALIPHATIC NITRILES OF THE FORMULA
Claim 2
Dependent Claim
74 words
A PROCESS FOR PREPARING POLYVINYL ACETATE WHICH IS CONVERTIBLE BY ALKALINE ALCOHOLYSIS TO POLYVINYL ALCOHOL WHICH SHOWS ALMOST NO TENDENCY TO GEL IN AQUEOUS SOLUTION, WHICH COMPRISES HOMOPOLYMERIZING VINYL ACETATE IN THE PRESENCE OF A FREE RADICAL INITIATOR AND IN 15 TO 85 PARTS BY WEIGHT OF A SOLVENT, BASED ON THE COMBINED WEIGHT OF MONOMER AND SOLVENT, SELECTED FROM THE GROUP CONSISTING OF ETHYLENE CARBONATE AND SATURATED LOWER ALIPHATIC NITRILES OF THE FORMULA
Claim 3
Dependent Claim
60 words
A PROCESS FOR PREPARING POLYVINYL ACETATE WHICH IS CONVERTIBLE BY ALKALINE ALCOHOLYSIS TO POLYVINYL ALCOHOL WHICH SHOWS ALMOST NO TENDENCY TO GEL IN AQUEOUS SOLUTION, WHICH COMPRISES ADMIXING A MONOMER CHARGE CONSISTING ESSENTIALLY OF VINYL ACETATE WITH A FREE RADICAL INITIATOR AND A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ETHYLENE CARBONATE AND SATURATED LOWER ALIPHATIC NITRILES OF THE FORMULA
Claim 4
Dependent Claim
60 words
A PROCESS FOR PREPARING POLYVINYL ACETATE WHICH IS CONVERTIBLE BY ALKALINE ALCOHOLYSIS TO POLYVINYL ALCOHOL WHICH SHOWS ALMOST NO TENDENCY TO GEL IN AQUEOUS SOLUTION, WHICH COMPRISES ADMIXING A MONOMER CHARGE CONSISTING ESSENTIALLY OF VINYL ACETATE WITH A FREE RADICAL INITIATOR AND A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ETHYLENE CARBONATE AND SATURATED LOWER ALIPHATIC NITRILES OF THE FORMULA
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) | 1966-11-18 | 1967-05-20 | 1967-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-18 | 1971-05-20 | 1971-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-18 | 1975-05-20 | 1975-11-19 | $7700.00 | Window Closed / Lapsed |