Appeal No. 96-3652
Application No. 08/348,820
This is a decision on appeal from the examiner’s final
rejection of claims 30 through 37, which are all of the claims
pending in this application.
BACKGROUND
The appellants’ invention relates to a method for forming
a silica-based layer on a glass article. An understanding of
the invention can be derived from a reading of exemplary claim
30 which has been reproduced below.
30. A method of forming a silica-based alkali barrier
layer on a surface of a glass article comprising the steps of:
providing an at least ternary gaseous mixture
comprising a major portion of a neutral gas, a gaseous
precursor of silicon and oxygen;
heating at least the surface of the glass article to
a temperature not less than 300°C;
positioning the heated surface of the glass article
at a distance less than 15 mm from a nozzle having a
projection slit; and
projecting the gaseous mixture through the nozzle
onto the heated surface transversely to the surface at
atmospheric pressure to form the barrier layer while causing
relative movement between the article and the nozzle in a
direction transverse to the slit.
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