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. 26, 1983
Filed:
Mar. 03, 1981
Ludwig Hosch, Darmstadt, DE;
Guenther Ittmann, Gross-Umstadt, DE;
Rohm GmbH, Darmstadt, DE;
Abstract
Disclosed is a method for covering a source emitting ultraviolet radiation which method comprises covering said source with an acrylic glass colored with a coloring agent which absorbs in the visible region of the spectrum between 400 nanometers and 550 nanometers and exhibits an absorption of at least 2 percent for any wavelength within this region, and which agent concurrently has an average degree of transmission in the A- and B-region of the ultraviolet spectrum which is not below 55 percent and is not less than 10 percent at any wavelength in this region, said agent being present at a concentration equivalent to 0.0005 to 0.3 percent by weight in a layer, one millimeter thick, of a radiation absorbing matrix. Also disclosed are colored acrylic glass covers for use in such a method.