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:
May. 20, 1997
Filed:
Jun. 05, 1996
Japan Atomic Energy Research Institute, Tokyo, JP;
Japan Vac's Metal Co., Ltd., Tokyo, JP;
Abstract
A ring-shaped metal gasket with the cross-section thereof being substantially rectangular shaped, with the ratio (t/w) of the thickness t of the ring portion to the width w thereof being in the range of 0.5 to 4, having a Vickers hardness in the range of 50 to 120; a vacuum flange for a metal gasket, including a sealing groove for receiving a metal gasket at the surface of the flange, the width of a cross section of the groove gradually decreasing in the direction of the depth thereof, an outer side wall section of the sealing groove being substantially perpendicular to the flange surface, and an inner side wall section of the sealing groove being inclined with respect to the flange surface, with a difference in level being provided so that the flange surface positioned to the inside of the sealing groove is lower than the flange surface positioned to the outside of the sealing groove, and a vacuum seal structure including the above gasket and flange are disclosed.