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:
Mar. 23, 1999
Filed:
May. 30, 1997
George J Cernigliaro, Freeport, ME (US);
Egon Matijevic, Potsdam, NY (US);
Daniel Y Pai, Millbury, MA (US);
Todd A Richardson, Lowell, MA (US);
Shipley Company, L.L.C., Marlborough, MA (US);
Abstract
The adsorption of cationic dyes on nanosize negatively charged silica particles to form colored pigments is disclosed. The dyes are chemisorbed and their uptake is controlled by the strong chemical reaction between the negative surface of the adsorbent silica particles preferably with sodium counter ions and the positive charge of the dyes. The prepared pigments are useful in the formation of color films and their optical properties are described. Photoresists using nanosized pigments are also disclosed herein which are useful in making color filters for liquid crystal displays.