Appeal No. 1996-4171
Application 07/762,298
directed to a method of removing heavy metal ions from a
particularly defined waste stream which contains complexing
anions through the use of a chelating resin containing amino-
phosphonic groups.
Representative Claim 1 is reproduced below:
1. A method for removing heavy metal ions from a waste
stream containing a plurality of complexing anions selected
from the group consisting of sulfates, nitrates, fluorides,
chlorides and carbonates, the method comprising;
providing a chelating resin containing amino-phosphonic
groups for capturing the heavy metal ions,
contacting the resin with the waste stream to reduce the
heavy metal ions concentration to less than 1 ppm,
eluting the resin by contact with a sequestering agent
and,
regenerating the resin for another cycle.
Prior art references relied upon by the examiner as
evidence of obviousness are:
Eccles, British Patent Application No. GB 214411A, published
February 27, 1985.
Purolite Technical Data Publication (Purolite), S-950
Macroporous Aminophosphonic Chelating Resin2
2This reference was made of record by appellant through
an information disclosure statement filed September 19, 1991
2
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