Patent US3235525A successfully refreshed from Google Patents.
US3235525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylidene chloride copolymer latices and products produced therefrom
Assignee: WR Grace and Co
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Filing: 1962-09-06
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Granted: 1966-02-15
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Expires: 1982-09-06
Abstract
No abstract record available.
Inventors
- 👤 Dudley G Woodard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:06
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
AN AQUEOUS EMULSION OF A TENARY POLYMER OBTAINED BY POLYMERIZING TOGETHER A MONOMER MIXTURE IN THE PRESENCE OF EMULSIFIER AND A POLYMERIZATION CATALYST AT A PH BETWEEN 1.5 AND 4.5, SAID MONOMER MIXTURE BEING COMPRISED OF FROM 80 TO 97 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE, FROM 0.33 TO 15 PERCENT BY WEIGHT OF 2CYANO (LOWER ALKYL) ARCYLATE WHEREIN THE ALKYL GROUP CONTAINS FROM 2 TO 4 CARBON ATOMS, AND FROM 1 TO 6.66 PERCENT BY WEIGHT OF AN ALKYL ESSTER SELECTED FROM THE GROUP CONSISTING OF AN ALKYL ACRYLATE AND AN ALKYL ITACONATE, SAID MONOMER MIXTURE BEING DISPERSED IN WATER IN A RATIO OF FROM 20 TO 72 PERCENT BY WEIHT OF THE TOTAL MONOMER MIXTURE AND CORRESPONDINGLY FROM 80 TO 28 PERCENT BY WEIGHT OF WATER UNTIL POLYMERIZATION IS SUBSTANTIALLY COMPLETE.
Claim 2
Dependent Claim
133 words
AN AQUEOUS EMULSION OF A TENARY POLYMER OBTAINED BY POLYMERIZING TOGETHER A MONOMER MIXTURE IN THE PRESENCE OF EMULSIFIER AND A POLYMERIZATION CATALYST AT A PH BETWEEN 1.5 AND 4.5, SAID MONOMER MIXTURE BEING COMPRISED OF FROM 80 TO 97 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE, FROM 0.33 TO 15 PERCENT BY WEIGHT OF 2CYANO (LOWER ALKYL) ARCYLATE WHEREIN THE ALKYL GROUP CONTAINS FROM 2 TO 4 CARBON ATOMS, AND FROM 1 TO 6.66 PERCENT BY WEIGHT OF AN ALKYL ESSTER SELECTED FROM THE GROUP CONSISTING OF AN ALKYL ACRYLATE AND AN ALKYL ITACONATE, SAID MONOMER MIXTURE BEING DISPERSED IN WATER IN A RATIO OF FROM 20 TO 72 PERCENT BY WEIHT OF THE TOTAL MONOMER MIXTURE AND CORRESPONDINGLY FROM 80 TO 28 PERCENT BY WEIGHT OF WATER UNTIL POLYMERIZATION IS SUBSTANTIALLY COMPLETE.
References Cited (Backward Citations)
US2538737A
Cited
US3094551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |