The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 1990
Filed:
Jul. 02, 1987
Applicant:
Inventor:
Charles Raufast, Saint Julien Les Martigues, FR;
Assignee:
BP Chemicals Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; B01J / ;
U.S. Cl.
CPC ...
422134 ; 422119 ; 422132 ; 422233 ; 422235 ;
Abstract
Apparatus for the production of polyolefins by the polymerization of alpha-olefins in the gas phase, in several stages, in at least two polymerization reactors interconnected by a transfer device making it possible to transfer the polyolefins resulting from the first reactor into the second reactor, in which the polymerization is continued under conditions identical to or different from those of the first reactor.