US3567798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers containing certain polar end blocks
Assignee: Shell USA Inc
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Filing: 1967-02-28
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Granted: 1971-03-02
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Expires: 1987-02-28
Abstract
Abstract NOVEL BLOCK COPOLYMERS EXHIBITING IMPROVED PROCESSABILITY HAVE THE CONFIGURATION A-B-A-C WHEREIN THE POLYMER BLOCKS A ARE RELATIVELY LOW MOLECULAR WEIGHT VINYL ARENE BLOCKS IMPARTING GOOD PROCESSABILITY, B IS A POLYMER BLOCK OF A CONJUGATED DIENE AND C IS A POLYMER BLOCK OF CERTAIN POLAR POLYMERIZABLE MONOMERS SELECTED FROM THE GROUP CONSISTING OF MONOVINYL PYRIDINES, ACRYLIC ACID ESTERS, METHACRYLIC ACID ESTERS, ACRYLONITRILES, METHACRYLONITRILES, MONOVINYLQUINOLINES AND ACRYLAMIDES IMPARTING IMPROVED STRESS-STRAIN PROPERTIES. THE SUBJECT BLOCK COPOLYMERS FIND PARTICULAR UTILITY IN IMPROVED ADHESIVE COMPOSITIONS.
Inventors
- 👤 Walter R Haefele
- 👤 Alfred W Shaw
- 👤 Eugene T Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:48
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/048
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |