Metal working – Method of mechanical manufacture – Dental appliance making
Reexamination Certificate
2007-04-24
2007-04-24
Jimenez, Marc (Department: 3726)
Metal working
Method of mechanical manufacture
Dental appliance making
C029S896100, C433S102000
Reexamination Certificate
active
10797552
ABSTRACT:
Method for manufacturing endodontic instruments having either helical or non-helical flutes with hard surfaces and resilient cutting edges by either an EDM or ECM process, wherein material is removed from the instrument blank in the desired flute pattern. The EDM or ECM process disintegrates the surface material, and as it cools, at least a portion of the removed material re-deposits onto the surface being machined to form a recast layer having a surface hardness that is at least about 15% greater than the hardness of the material forming the instrument blank.
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Aloise Carlos A.
Garman Gary T.
Jimenez Marc
Ormco Corporation
Wood Herron & Evans LLP
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