You can also get to this patent application by going to
http://www.uspto.gov; use the quick search link; type in "beeswax" in
the first search term field; type in "coumafos" for the second term;
ensure that the operator is "AND" (this eliminates many hits due to the
fact that "beeswax" has lots of patents on its use).  The end result
should be the patent that you are looking for.

Just to ensure, I have included the link to the actual patent
application below (you may have to cut and paste to get the whole link
into the Browser window).

> D. McBride found
>
> U.S. patent 6,586,610, "Method for removing coumafos from beeswax",
>
> I have tried many searches and cannot get a handle on it, can you
remember
> what you were searching for when you came across it?
>

http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2F
netahtml%2FPTO%2Fsearch-adv.html&r=1&f=G&l=50&d=PG01&p=1&S1=%28beeswax+A
ND+coumafos%29&OS=beeswax+and+coumafos&RS=(beeswax+AND+coumafos)

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