Patent US3801549A successfully refreshed from Google Patents.
US3801549A
Expired / Lapsed
US
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Low melt viscosity molding process for high heat distortion interpolymers
Assignee: Dow Chemical Co
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Filing: 1972-10-17
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Granted: 1974-04-02
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Expires: 1992-10-17
Abstract
Abstract THE IMPROVEMENT OF THIS INVENTION IS A RESULT OF MODIFYING THE F;OW BEHAVIOR OF ALKENYL AROMATIC THEROMOPLASTIC INTERPOLYMERS TO PROVIDE BOTH HIGH HEAT DISTORTION AND LOW MELT VISCOSITY, THE MODIFICATION IS THE RESULT OF INTRODUCING INTO THE INTERPOLYMER ABOUT 5 TO 50 MOLE PERCENT OF N-ALKYL DICARBOXYLIC IMIDE GROUPS WHERE THE ALKYL GROUP CONTAINS FROM 1 TO 6 CARBON ATOMS.
Inventors
- 👤 D Pickelman
- 👤 E Moore
- 👤 L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:02
CPC Classifications
C; C08; C08F; C08F8/00
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 |