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:
Oct. 16, 2012
Filed:
Dec. 23, 2009
Marc Maurer, Village-Neuf, FR;
Max Hügin, Rünenberg, CH;
Thomas Raimann, Sisseln, CH;
Leonhard Feiler, Binzen, DE;
Bruno Inderbitzin, Bouxwiller, FR;
André Fuchs, Schliengen-Obereggenen, DE;
Marc Maurer, Village-Neuf, FR;
Max Hügin, Rünenberg, CH;
Thomas Raimann, Sisseln, CH;
Leonhard Feiler, Binzen, DE;
Bruno Inderbitzin, Bouxwiller, FR;
André Fuchs, Schliengen-Obereggenen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to a photochromic ink, the process for its preparation which is based on a spiropyran powder obtainable by melting, cooling and crushing, and to a new form of a spiropyran obtainable thereby. Said process to prepare a photochromic ink comprises the steps of a) heating and melting the spiropyran at a temperature below 250 C, b) cooling the melt to obtain a solidified spiropyran, c) crushing the solidified spiropyran to obtain a powder, d) optionally adding the powder to a binder providing the basis for the photochromic ink.