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. 20, 2001
Filed:
May. 14, 1999
Geoffrey P. Morris, White Bear Lake, MN (US);
Jacqueline C. Rolfs, River Falls, WI (US);
Leo A. Meyer, St. Paul, MN (US);
Robert S. Moshrefzadeh, Oakdale, MN (US);
Hsin-Hsin Chou, Woodbury, MN (US);
Billy J. Tompkins, Russelville, AL (US);
Thomas N. Davis, Fayette, AL (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Glass microspheres and rear projection screens containing glass microspheres, which combine a desirable index of refraction (preferably, no greater than about 1.70) and low levels of defects (e.g., bubbles, visible haziness, frostiness, or opacity, substantially nonspherical shapes) upon formation are provided. Also provided is a coating method of placing microspheres on a film for use in a rear projection screen.