Appeal No. 2005-0183
Application No. 09/206,218
allowance of Application No. 09/206,216 (Brief, page 6).
Accordingly, we summarily affirm the examiner’s rejection.
B. The Rejections under § 103(a)
The examiner finds that EP ‘060 discloses a process for
producing olefins by catalytic cracking of a hydrocarbon feed
using a zeolitic catalyst including silicalite and ZSM-5 with
silicon/aluminum atomic ratios equal to or greater than 175
(corresponding to a molar ratio of equal to or greater than
350)(Answer, page 3). The examiner also finds that EP ‘060 fails
to disclose, inter alia, that the catalyst has been pretreated to
increase the silicon/aluminum ratio and increase the stability of
the catalyst (Answer, page 4).
The examiner finds that Eberly discloses a process for
treating a zeolite by steaming followed by contact with a
complexing agent to remove aluminum from the gross structure of
the zeolite thereby increasing the silicon/aluminum ratio of the
zeolite (id.). From these findings, the examiner concludes that
it would have been obvious to one of ordinary skill in the art at
the time of appellants’ invention to have modified the process of
EP ‘060 “by dealuminating the zeolite to achieve the desired
silicon:aluminum atomic ratio as suggested by Eberly because the
resulting zeolite will have higher stability” (Answer, page 5).
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