Metal working – Method of mechanical manufacture – Dental appliance making
Reexamination Certificate
2005-02-23
2010-06-29
Chang, Rick K (Department: 3726)
Metal working
Method of mechanical manufacture
Dental appliance making
C029S896100, C029S882000, C072S205000
Reexamination Certificate
active
07743505
ABSTRACT:
Endodontic instruments or intermediate products (e.g., blanks) used to form finished endodontic instruments having a desired cutting edge and/or taper are formed, at least in part, by molding a metal powder into a desired shape and then sintering the metal particles together. The metal powder is initially formed into a green molded part that is sintered to yield a solid metal part. The sintered metal part may optionally be further processed by additional steps, as needed, to yield a finished endodontic instrument. One additional process includes cold forming the sintered metal body to provide a cutting edge, remove cracks and microfissures, or otherwise modify the characteristics of an intermediate product or endodontic instrument. Other processes include chemical milling and mechanical milling, grinding or cutting to sharpen the cutting edge, form a taper, or otherwise modify the intermediate product or endodontic instrument in a desired manner.
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Lewis Paul
Nielsen John
Chang Rick K
Ultradent Products Inc.
Workman Nydegger
LandOfFree
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