Appeal No. 1996-3470
Application 08/313,179
tolerance for zinc. See Kramer at column 4, lines 11 through 28.
Based on these disclosures, the examiner persuasively argues that
one of ordinary skill in the art would have been led to have
added a hydroxylamine compound to the zinc phosphate composition
of Gehmecker motivated by a reasonable expectation of success for
achieving the benefits of hydroxylamine compound addition. See
the examiner's answer at pages 2 and 3.
Similarly, the examiner points out that Müeller also
discloses that hydroxylamine compounds may be added to zinc
phosphate compositions. As the examiner accurately points out,
Müeller at column 2, lines 65 to column 3, line 1, indicates that
in a preferred embodiment of the disclosed invention, a metal
work piece may be contacted by dipping it into a phosphating
solution containing hydroxylamine “which accelerates the
phosphating process.” In light of this disclosure in Müeller,
the examiner persuasively argues that one of ordinary skill in
this art would have been led to have added hydroxylamine compound
to the phosphating composition of Gehmecker for the purpose of
accelerating the reaction.
Appellants contend that the process of their invention
provides coatings with excellent corrosion resistance in the
absence of nickel ions and nitrite ions generally found in the
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