Patent US3757000A successfully refreshed from Google Patents.
US3757000A
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Copolymers and preparational method therefor
Assignee: Velsicol Chemical LLC
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Filing: 1970-10-29
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Granted: 1973-09-04
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Expires: 1990-10-29
Abstract
Abstract A SOLID, HOMOGENEOUS AND ESSENTIALLY RANDOM COPOLYMER OF STYRENE AND ISOBUTYLENE HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 1000 TO ABOUT 4000, A HETEROGENEITY INDEX OF FROM ABOUT 1.50 TO ABOUT 2.25 AND A STYRENE CONTENT OF FORM ABOUT 40 TO ABOUT 90 WEIGHT PERCENT WITH ITS HIGHER MOLECULAR WEIGHT FRACTIONS HAVING A HIGHER STYRENE CONTENT THAN THE AVERAGE STYRENE CONTENT OF THE COPOLYMER.
Inventors
- 👤 F Scardiglia
- 👤 T Hokama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:15
CPC Classifications
C; C09; C09J; C09J125/00; C09J125/02; C09J125/04; C09J125/08; C08; C08F; C08F10/00; C08F210/00; C08F210/04; C08F210/08; C08F210/10; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L91/00; C08L91/06; C09J121/00; C09J123/00; C09J123/02; C09J123/04; C08L23/26; C08L2023/40; C08L2023/42; C08L21/00; C08L2205/00; C08L2205/03; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0853; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/06; C08L2666/08; C08L7/00
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |