Appeal No. 2000-1092 2
Application No. 08/933,959
THE INVENTION
The invention is directed to an iron powder having a median particle size diameter of
less than or equal to 20 microns, the particle having a rounded, randomly shaped contour.
Additional limitations are provided in the following illustrative claim.
THE CLAIM
Claim 1 is illustrative of appellants’ invention and is reproduced below.
1. Iron powder produced in accordance with the method of:
(a) heating iron oxide powder of a particle size diameter of less that
1000 microns in a reducing agent atmosphere at a temperature between
1000/F and 2100/F for a time sufficient to reduce the iron oxide powder to
iron powder;
(b) cooling the heated iron powder in an inert gas atmosphere to a
temperature below 150/F; and
(c) milling the cooled iron powder in an inert gas atmosphere to a
median particle size diameter of less than or equal to 20 microns and with a
rounded, randomly shaped contour.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references.
Freeman 3,276,921 Oct. 04, 1966
König et al. (Konig) 5,403,375 Apr. 04, 1995
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