Appeal No. 1999-0286 Page 7
Application No. 08/777,413
and accustomed meaning, unless it appears that the inventor
used them differently." Envirotech Corp. v. Al George, Inc.,
730 F.2d 753, 759, 221 USPQ 473, 477 (Fed. Cir. 1984).
Second, it is equally "fundamental that claims are to be
construed in the light of the specification and both are to be
read with a view to ascertaining the invention." United
States v. Adams, 383 U.S. 39, 49, 148 USPQ 479, 482 (1966).
Furthermore, the general claim construction principle
that limitations found only in the specification of a patent
or patent application should not be imported or read into a
claim must be followed. See In re Priest, 582 F.2d 33, 37,
199 USPQ 11, 15 (CCPA 1978). One must be careful not to
confuse impermissible imputing of limitations from the
specification into a claim with the proper reference to the
specification to determine the meaning of a particular word or
phrase recited in a claim. See E.I. Du Pont de Nemours & Co.
v. Phillips Petroleum Co., 849 F.2d 1430, 1433, 7 USPQ2d 1129,
1131 (Fed. Cir.), cert. denied, 488 U.S. 986 (1988).
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