Interference No. 104,313
Sauer Inc. v. Kanzaki Kokyukoki Mfg. Co., Ltd.
that the invention would work for its intended purpose. Cooper v. Goldfarb, 154 F.3d 1321,
1326, 47 USPQ2d 1896, 1900 (Fed. Cir. 1998). A reduction to practice does not occur until the
inventor has determined that the invention will work for its intended purpose. Estee Lauder Inc.
v. L'Oreal S.A., 129 F.3d 588, 593, 44 USPQ2d 1610,1614 (Fed. Cir. 1997). Accordingly,
Sauer did not actually reduce the invention to practice on August 17, 1988, and the earliest date
of actual reduction to practice Sauer could have appears to be sometime in October of 1988.
Although some inventions are so simple and their purpose and efficacy so obvious that their
complete construction is sufficient to demonstrate workability, Mahurkar v. C.R. Bard, Inc., 79
F.3d 1572,1578, 38 USPQ2d 1288, 1291 (Fed. Cir. 1996), Scott v. Finne 34 F.3d 1058, 1061,
32 USPQ2d 1115, 1118 (Fed. Cir. 1994), Sauer does not contend and we do not find that the
invention of the count of this interference is such d case.
In its opposition brief,. Kanzaki does not seek to demonstrate a date of conception for the
invention of the count prior to the date of its Japanese priority application, February 3, 1988.
Therefore, Sauer's date of conception need only be prior to February 3, 1988, provided that there
is a showing of reasonable diligence in reducing the invention to practice. Kanzaki disputes
Sauer's assertion that Sauer had conceived of the invention of the count on September 8, 1987.
But we need not reach that question here, because even assuming that Sauer has a date of
conception prior to February 3, 1988, and even ftuther assuming that Sauer has an actual
reduction to practice sometime in October of 1988, Sauer has failed to demonstrate reasonable
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