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
K�nig et al. (Konig) 5,403,375 Apr. 04, 1995
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