Patent US3557070A successfully refreshed from Google Patents.
US3557070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethylene polymers
Assignee: Gulf Research and Development Co
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Filing: 1967-12-28
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Granted: 1971-01-19
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Expires: 1987-12-28
Abstract
Abstract ETHYLENE-ACRYLATE COPOLYMERS WHEREIN THE SUBSTITUENT ACRYLATE GROUPS ARE CONVERTED TO THE AMIDE AND ACID FORM ARE OBTAINED BY THE THERMAL DECOMPOSITION OF AN ETHYLENEISOPROPYL ESTER OF ACRYLIC OR METHACRYLIC ACID IN AN INERT ATMOSPHERE WHICH IS FOLLOWED BY CONVERSION OF THE ANHYDRIDE IN A SECOND THERMAL REACTION STEP TO PRODUCE AN ETHYLENE-ACRYLIC ACID OR ETHYLENE-ACRYLAMIDE-ACRYLIC ACID POLYMER.
Inventors
- 👤 Harry D Anspon
- 👤 Bert H Clampitt
- 👤 Ronald E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:35
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |