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. 07, 2020
Filed:
Jan. 29, 2018
Toray Industries, Inc., Tokyo, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A method of cleaning an oxidation oven that subjects a polyacrylonitrile-based precursor fiber for carbon fiber to an oxidation treatment in an oxidizing atmosphere, wherein the oxidation oven has a mechanism for circulating an oxidizing gas internally, the method including the steps of: causing a liquid to come in contact with dust adhering to a wall surface of the oxidation oven so that pressure in a direction perpendicular to the wall surface is 2 MPa or more; discharging the liquid out of the oxidation oven to discharge dust peeled off from the wall surface out of the oxidation oven; and circulating an oxidizing gas having a temperature of 40° C. or higher in the oxidation oven.