Patent US3291769A successfully refreshed from Google Patents.
US3291769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyvinylidene chloride copolymer emulsions
Assignee: Scott Bader Co Ltd
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Filing: 1963-10-28
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Granted: 1966-12-13
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Expires: 1983-10-28
Abstract
No abstract record available.
Inventors
- 👤 Woodford David Malcolm
- 👤 Brown Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:43
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD FOR THE PRODUCTION OF AN AQUEOUS STABLE AMORPHOUS POLYVINYLIDENE EMULSION WHICH COMPRISES FEEDING SEPARATE FLOWS OF VINYLIDENE CHLORIDE MONOMER COMPONENT AND A COMONOMER COMPONENT INTO A REACTION CHAMBER CONTAINING WATER, THERE BEING PRESENT DURING THE COPOLYMERISATION REACTION AT LEAST A POLYMERISATION CATALYST AND A SURFACTANT, WHEREIN THE QUANTITY OF THE VINYLIDENE CHLORIDE MONOMER COMPONENT REQUIRED FOR THE COPOLYMERISATION REACTION IS INTRODUCED INTO THE REACTION CHAMBER AT SUCH A RATE THAT THE ADDITION OF THE TOTAL VINYLIDENE CHLORIDE MONOMER COMPONENT REQUIRED IS COMPLETED BEFORE COMPLETION OF THE ADDITION OF THE TOTAL COMONOMER COMPONENT REQUIRED FOR THE COPOLYMERISATION WHEREBY BETWEEN ABOUT ONE TWENTIETH AND ABOUT ONE THIRD BY WEIGHT OF THE TOTAL COMONOMER COMPONENT REQUIRED IS ADDED TO THE REACTION CHAMBER AFTER THE ADDITION OF THE TOTAL VINYLIDENE CHLORIDE MONOMER COMPONENT REQUIRED HAS BEEN COMPLETED, THE COMONOMER COMPONENT BEING ADDED CONTINUOUSLY DURING THE COPOLYMERISATION REACTION.
Claim 2
Independent Claim
145 words
A METHOD FOR THE PRODUCTION OF AN AQUEOUS STABLE AMORPHOUS POLYVINYLIDENE EMULSION WHICH COMPRISES FEEDING SEPARATE FLOWS OF VINYLIDENE CHLORIDE MONOMER COMPONENT AND A COMONOMER COMPONENT INTO A REACTION CHAMBER CONTAINING WATER, THERE BEING PRESENT DURING THE COPOLYMERISATION REACTION AT LEAST A POLYMERISATION CATALYST AND A SURFACTANT, WHEREIN THE QUANTITY OF THE VINYLIDENE CHLORIDE MONOMER COMPONENT REQUIRED FOR THE COPOLYMERISATION REACTION IS INTRODUCED INTO THE REACTION CHAMBER AT SUCH A RATE THAT THE ADDITION OF THE TOTAL VINYLIDENE CHLORIDE MONOMER COMPONENT REQUIRED IS COMPLETED BEFORE COMPLETION OF THE ADDITION OF THE TOTAL COMONOMER COMPONENT REQUIRED FOR THE COPOLYMERISATION WHEREBY BETWEEN ABOUT ONE TWENTIETH AND ABOUT ONE THIRD BY WEIGHT OF THE TOTAL COMONOMER COMPONENT REQUIRED IS ADDED TO THE REACTION CHAMBER AFTER THE ADDITION OF THE TOTAL VINYLIDENE CHLORIDE MONOMER COMPONENT REQUIRED HAS BEEN COMPLETED, THE COMONOMER COMPONENT BEING ADDED CONTINUOUSLY DURING THE COPOLYMERISATION REACTION.
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |