Appeal No. 96-0126
Application 07/942,400
composition having improved anti-icing properties consisting
essentially of a glycol, a pH-adjusting agent and a surfactant
in an amount sufficient to cause the composition to have a
certain contact angle on aluminum and a certain surface
tension to thereby provide a spreading wetting value w of 0 to
about -5 dynes per centimeter. Further details of this
appealed subject matter are set forth in representative
independent claim 1 which reads as follows:2
1. A deicer composition having improved anti-icing
properties consisting essentially of from about 25% to about
95% by weight based on the weight of the total composition of
glycol selected from the group consisting of ethylene glycol,
diethylene glycol, triethylene glycol, polyethylene glycol,
propylene glycol, dipropylene glycol, glycerol, and mixtures
thereof; a pH-adjusting agent in an amount sufficient to
provide a pH of 7 to about 10; and at least one nonionic or
anionic surfactant, or mixtures thereof, in an amount
sufficient to cause the composition to have a contact angle 2
on aluminum of 0 to about 35E and a surface tension * of about
15 to about 40 dynes per centimeter, to provide a spreading
wetting value w of 0 to about -5 dynes per centimeter in the
equation w = (cos 2 +1); optionally, a corrosion inhibitor;
the remainder of the composition being water.
2 We note that, on page 3 of the Brief, the appellants request amendments to the
specification and claim 1 relating to the recited equation for determining the value w.
This requested amendment should have been filed as a separate paper rather than as part
of the Brief (see 37 CFR § 1.4(c) and MPEP § 1206 at page 1200-6 (Rev. 3, July 1997))
and has not been entered (or otherwise responded to) by the examiner. Thus, the
aforementioned equation remains unamended in the form originally filed. Further comments
regarding this equation and the appellants’ requested amendment thereto will be made in
the opinion section of this Brief.
2
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