Appeal No. 2000-1038
Application No. 08/888,042
Claim 23 is representative of the subject matter on
appeal and reads as follows:
23. A method for cleaning limescale from a surface which
comprises applying a biodegradable aqueous acid cleaning
composition, said composition comprising iminodiacetic
acid;
from 0.2 weight percent to 6 weight percent
based on the total weight of said composition of a
thickener selected from the group consisting of
biopolymers, cross-linked polyacrylates, modified
polyacrylates, and mixtures thereof; and
an enzyme mixture, wherein said mixture
comprises a plurality of enzymes selected from the group
consisting of carbohydrase enzymes, gluconase enzymes and
mixtures thereof;
wherein said composition has a pH of 0.1-5.
The sole prior art reference relied upon by the examiner
is:
Carpenter et al. (Carpenter) 5,238,843 Aug.
24, 1993
Claims 23, 24, 27, and 28 stand rejected under 35 U.S.C.
§ 103 as unpatentable over the disclosure of Carpenter.1
We have carefully evaluated the claims, specification,
1The examiner has withdrawn the rejection of claims 23,
24, 27, and 28 under 35 U.S.C. § 112, second paragraph, set
forth in the final Office action dated November 17, 1998. See
Answer, page 3.
2
Page: Previous 1 2 3 4 5 Next
Last modified: November 3, 2007