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2121 MANUAL OF PATENT EXAMINING PROCEDURE<br />

As noted in Brouwer, 77 F.3d at425, 37 USPQ2d at<br />

1666, the inquiry as to whether a claimed invention<br />

would have been obvious is "highly fact-specific by<br />

design". Acc<strong>or</strong>dingly, obviousness must be assessed<br />

on a case-by-case basis. <strong>The</strong> following decisions are<br />

illustrative of the lack of per se rules in applying the<br />

test f<strong>or</strong> obviousness under 35 U.S.C. 103 and of the<br />

fact-intensive comparison of claimed processes with<br />

the pri<strong>or</strong> art: In re Durden, 763 F.2d 1406, 226 USPQ<br />

359 (Fed. Cir. 1985) (<strong>The</strong> examiner rejected a claim<br />

directed to a process in which patentable starting<br />

materials were reacted to f<strong>or</strong>m patentable end products.<br />

<strong>The</strong> pri<strong>or</strong> art showed the same chemical reaction<br />

mechanism applied to other chemicals. <strong>The</strong> court held<br />

that the process claim was obvious over the pri<strong>or</strong> art.);<br />

In re Albertson, 332 F.2d 379, 141 USPQ 730 (CCPA<br />

1964) (Process of chemically reducing one novel,<br />

nonobvious material to obtain another novel, nonobvious<br />

material was claimed. <strong>The</strong> processwas held<br />

obvious because the reduction reaction was-old.); In<br />

re Kanter, 399 F.2d 249, 158 USPQ 331 (CCPA 1968)<br />

(Process of silic

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