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:
Sep. 15, 2020
Filed:
May. 02, 2018
Ngk Insulators, Ltd., Nagoya, JP;
NGK Insulatros, Ltd., Nagoya, JP;
Abstract
An inert gas substituting method includes: a closing step of accommodating a honeycomb formed body in an indoor space of a gas substituting chamber and closing the same with airtightness from the outside being maintained; a pressure reducing step of reducing the pressure in the indoor space to a preset first vacuum pressure; a pressure increasing step of introducing argon gas into the pressure-reduced indoor space and increasing the pressure to a second vacuum pressure which is higher than the first vacuum pressure and lower than atmospheric pressure; a pressure re-reducing step of reducing the pressure to the first vacuum pressure again; and a pressure recovering step of repeating the pressure increasing step and the pressure re-reducing step at least twice, introducing argon gas into the indoor space in which the pressure has been reduced to the first vacuum pressure again, and recovering the pressure to atmospheric pressure.