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:
Jan. 04, 1994
Filed:
Mar. 08, 1991
Kazuei Kenmochi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A covering device includes a surface-indented covering member with at least one groove formed in its surface. The at least one groove has a depth in the range of 0.2 to 0.4 microns and a width which is not more than the depth thereof and is greater than 0 and not more than 0.4 microns. Another covering device includes a surface-indented covering member with a groove formed in its surface, and a covering material disposed on the surface of the member to cover at least the groove thereunder. The depth of the groove is in a range from 0.12 to 0.3 microns, and the width thereof is not more than the depth and is greater than 0 and not more than 0.3 microns. The covering material is transparent and has a refractive index smaller than that of the covering member.