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:
Aug. 28, 1984
Filed:
Jun. 18, 1982
Applicant:
Inventors:
Masahiro Kaneko, Izumi, JP;
Tadashi Asanuma, Izumi, JP;
Nobutaka Uchikawa, Takaishi, JP;
Ichiro Fujio, Izumi, JP;
Tetsunosuke Shiomura, Takaishi, JP;
Assignee:
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B08B / ; B01D / ;
U.S. Cl.
CPC ...
134 2213 ; 134 2214 ; 134 2217 ; 134 2219 ; 134 12 ; 203 72 ; 203 76 ; 528484 ; 422901 ;
Abstract
Method of adding water and a hydroxide of an alkali metal or alkaline earth metal to a washing solvent such as an alkylamide and/or alkylsulfoxide when washing and removing high molecular substances stuck on the interior of a production apparatus or molding machine for an aromatic vinyl-acrylonitrile copolymer. A method for regenerating and recovering the washing solvent used for the above-mentioned washing and removal by means of an evaporator and distillation tower.