US3801529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymer-polyvinyl chloride compositions
Assignee: Shell USA Inc
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Filing: 1973-02-12
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Granted: 1974-04-02
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Expires: 1993-02-12
Abstract
Abstract THE PROCESSABILITY OF POLYVINYL CHLORIDE RESINS IS SUBSTANTIALLY IMPROVED BY BLENDING THEREWITH A MINOR PROPORTION OF CERTAIN BLOCK COPOLYMERS, THE TWO COMPONENTS HAVING IMPROVED COMPATIBILITY BY THE PRESENCE OF CERTAIN MONOMERIC PLASTICIZERS HAVING A SOLUBILITY PARAMETER BETWEEN ABOUT 8.0 AND 11.0.
Inventors
- 👤 R Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:33
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L53/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |