US3763125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerisation processes using improved friedel crafts catalysts
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-02-07
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Granted: 1973-10-02
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Expires: 1992-02-07
Abstract
Abstract IN A FRIEDEL-CRAFTS CATALYSED POLYMERISATION IN WHICH, FOR EXAMPLE, ALUMINIUM CHLORIDE IS USED TO CATALYSE THE POLYMERISATION OF AN UNSATURATED PETROLEUM FRACTION TO PRODUCE A PETROLEUM RESIN, THE IMPROVED CATALYST COMPLEX COMPRISES ALUMINIUM CHLORIDE/HYDROGEN CHLORIDE AND A BENZENE SUBSTIUTED BY AT LEAST ONE SECONDARY OR TERITARY ALKYL GROUP, E.G. CUMENCE OR P-CYMENE, OR CYCLOALKYL GROUP.
Inventors
- 👤 A Moody
- 👤 I Ripley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:53
CPC Classifications
C; C08; C08F; C08F240/00; C08F10/00; C08F36/00; C08F36/02; C08F36/04; C08F4/00
Claims Analysis
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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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |