US3740383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of fibrillated structures
Assignee: Solvay SA
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Filing: 1969-12-11
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Granted: 1973-06-19
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Expires: 1989-12-11
Abstract
Abstract FIBRILLATED STRUCTURES OF POLYETHYLENE AND COPOLYMERS OF ETHYLENE ARE PRODUCED DIRECTLY FROM THE POLYMERIZATION OR COPOLYMERIZATION OF ETHYLENE. THE POLYMERIZATION IS CARRIED OUT IN A DILUENT UNDER LOW PRESSURE AND IN THE PRESENCE OF A CATALYST HAVING AN ACTIVITY OF AT LEAST 5000 G. OF POLYMER PER GRAM OF THE METAL PRESENT IN THE CATALYST. UNREACTED ETHYLENE IS ALLOWD TO ESCAPE AND THE MIXTURE OF THE POLYMER IN THE DILUENT IS THEN HEATED UNDER AT LEAST AUTOGENEOUS PRESSURE. THE FIBRILLATED STRUCTURE IS PRODUCED BY THE INSTANTANEOUS VAPORIZATION OF THE DILUENT BY TRANSFER OF THE DILUENT-POLYMER MIXTURE THROUGH AN ORIFICE AND INTO AN ENCLOSURE MAINTAINED UNDER LOW PRESSURE.
Inventors
- 👤 R Gabellieri
- 👤 M Osterrieth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:25
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/11; C; C08; C08F; C08F10/00; C08F10/02
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |