Take a look at this link :
Patches: HP-UX
HP offers a tool called HPSUM to analyze and patch all of their servers running any supported operating system (HPUX, RHEL ...)
It's a essentially a program, ran on the PC/laptop with ssh credentials and IP address of the server provided.
It will connect to machine and generate report for you, on which to act.
Most of the HPUX patching nowdays consist of applying bundles not individual patches.
Hope that helps
Regards
Peasant.