How do I configure swlist to not display superseded patches?

A new option to swlist, "show_superseded_patches", was
introduced in HP-UX 11.00 via the SD-UX cumulative patch
PHCO_20078.  In 11.00, by default, swlist displays all
installed patches, including superseded ones.  In 11.10+,
by default, swlist does not display superseded patches.

Assuming you have PHCO_20078, or any more recent SD-UX
cumulative patch installed, you may change the default
behavior of swlist in 11.00. To do so, add the following
line to the file /var/adm/sw/defaults:

swlist.show_superseded_patches = false

Reference:
http://www.faqs.org/faqs/hp/hpux-faq/section-160.html