Appeal No. 2000-0316 2
Application No. 08/587,821
sandstone in the absence of substantial precipitation of aluminum fluoride complexes. An
acidizing composition comprising water, at least one hydroxy carboxylic acid in a specific
amount and hydrofluoric acid is contacted with an aluminum containing sandstone
formation. Additional limitations are disclosed in the following illustrative claim.
THE CLAIM
Claim 26 is illustrative of appellants’ invention and is reproduced below:
26. A method of acidizing an aluminum containing sandstone formation
without substantial aluminum fluoride complexes precipitation comprising
contacting the formation with an acidizing composition including:
water;
hydrofluoric acid; and
at least one hydroxy carboxylic acid present in an amount in the range of
from 2.1% to about 10% by weight of said acidizing composition.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references:
Stoesser 2,175,095 Oct. 3, 1939
Kalfayan et al. (Kalfayan) 4,479,543 Oct. 30, 1984
THE REJECTION
Claims 26, 27, 72 through 78, and 82 stand rejected under 35 U.S.C. § 103(a)
as being unpatentable over Kalfayan in view of Stoesser.
OPINION
We have carefully considered all of the arguments advanced by the appellants and
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