US3766215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of adducts from maleic anhydride and liquid low molecular weight polybutadienes
Assignee: Huels AG
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Filing: 1971-03-16
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Granted: 1973-10-16
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Expires: 1991-03-16
Abstract
Abstract ADDUCTS OF LIQUID POLYBUTADIENES AND MALEIC ANHYDRIDE OF A VISOSITY AND COLOR SUITABLE FOR THE PRODUCTION OF SYNTHETIC VARNISHES ARE PRODUCED BY CONDUCTING THE REACTION IN THE PRESENCE OF A CHELATING AGENT, E.G., ETHYLENEDIAMINETETRAACETIC ACID OR THE DISODIUM SALT THEREOF.
Inventors
- 👤 K Hesse
- 👤 K Gorke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:19
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/28
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |