Appeal No. 1997-0153
Application No. 08/375,681
642 F.2d 413, 425, 208 USPQ 871, 881 (CCPA 1981). The
appellants have not provided any rationale as to why the
choice of a prior art type of filter with its self-evident
advantages (such as disclosed by Braun) would not have been
obvious to one of ordinary skill when practicing the invention
of Schlobohm.
Schlobohm does not specify the type of respirator filter
used in the disclosed respirator mask. Accordingly, it is our
view that an artisan would have selected from among known
filters to practice the invention of Schlobohm. We consider
that it would have been obvious to one of ordinary skill,
practicing the invention of Schlobohm, to select a known
filter type such as Braun’s bonded sorbent filter. We note
that the appellants’ specification at page 2 lines 23-31 cites
the use of bonded sorbent filters in several prior art patents
(including the patent to Braun).
It is urged (brief, page 3) that Schlobohm does not teach
“having the filter cartridge housing compress the filter
element to create an interference fit.” The appellants stress
6
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007