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. 13, 1993
Filed:
Jul. 23, 1992
Todd A Berg, Louis Park, MN (US);
Donley D Rowenhorst, Maplewood, MN (US);
James G Berg, Lino Lakes, MN (US);
William K Leonard, River Falls, WI (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A method of making abrasive particles having a specified shape and abrasive articles containing abrasive particles having a specified shape. The method for preparing such an abrasive particle comprises the steps of: (a) providing a dispersion of comprising particles that can be converted into alpha alumina, preferably particles of alpha alumina monohydrate, in a liquid, which liquid comprises a volatile component, preferably water; (b) providing a mold having a first generally planar surface and a second surface opposed to said first surface, said first surface having an opening to a mold cavity having a specified shape; (c) introducing the dispersion into the mold cavity in such a way that no exposed surface of the dispersion that has been introduced into the mold will extend substantially beyond the plane formed by the first surface of the mold; (d) removing a sufficient portion of the volatile component from the dispersion while the dispersion is in the mold cavity, thereby forming a precursor of an abrasive particle having a shape approximately corresponding to the shape of the mold cavity; (e) removing the precursor of the abrasive particle from the mold cavity; (f) calcining the removed precursor of the abrasive particle; and (g) sintering the calcined precursor to form the desired abrasive particle.