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:
Jul. 14, 1981
Filed:
Dec. 04, 1979
Theodor P Moench, Gross-Umstadt-Heubach, DE;
Friedrich Hanstein, Gross-Zimmern, DE;
Rohm GmbH, Darmstadt, DE;
Abstract
A shaped acrylic glass body is provided which has a reshaped inner zone outside the plane of the border or edge region and which is characterized by excellent resistance to weather and to chemical corrosion. The shaped body is manufactured from an extruded plate of a polymer or copolymer containing at least 80% by weight of polymethylmethacrylate or a copolymer of methyl methacrylate. The extruded plate is subjected to biaxial stretching, by at least about 25% in each direction and, while the edges or border regions are gripped to maintain their dimensions, a force is applied to the interior portion of the plate while it is in a thermoelastic state to move the interior portion out of the plane of the surrounding edges.