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:
Apr. 28, 1981
Filed:
Jul. 19, 1979
Jean-Pierre Durand, Chatou, FR;
Francois Dawans, Bougival, FR;
Alain Faure, Saint Chamond, FR;
Paul Maldonado, Saint Symphonin, FR;
Institut Francais du Petrole, Reuil-Malmalson, FR;
Elf-Union, Paris, FR;
Abstract
Heavy fuel-oil composition of improved stability under storage conditions, comprising a petroleum residue obtained from a straight run distillation, a vacuum distillation or a viscosity reduction of petroleum materials, a diluent such as a steam-cracking residue, a viscosity reduction gas oil or a mixture thereof, and a minor proportion of a sequenced copolymer formed of two polymeric sequences (A) and (B) wherein sequence (A) is obtained by polymerization of one or more conjugated diolefins such as 1,3-butadiene and isoprene and sequence (B) is obtained by polymerization of acrylonitrile or an alkylacrylonitrile such as methacrylonitrile, said sequenced copolymer having an average molecular weight by number of from 1,000 to 20,000.