Randall T German

US Patent:

56519311, Jul 29, 1997

Filed:

Dec 28, 1995

Appl. No.:

8/581301

Inventors:

Michael L. Bailey - Oak Harbor WA
Rajkumar Raman - Arlington VA
Randall M. German - State College PA

Assignee:

Upchurch Scientific, Inc. - Oak Harbor WA

International Classification:

B29C 4302

US Classification:

264126

Abstract:

A method for making a biocompatible filter whereby a biocompatible powder is sintered to form a disk-shaped filter. The biocompatible powder is first sized to obtain a preselected average particle size. Next, the powder is introduced to a die in which the powder is pressed to a predetermined force to form "cakes. " The pressed powder "cakes" are then placed into an oven or furnace, which is heated to a preselected temperature. The powder cakes are held at the elevated temperature to sinter the particles in the powder together. After a preselected amount of time, the now-sintered powder cakes are removed and allowed to cool. This method produces biocompatible filters useful in liquid chromatography and other applications.