The main use of a patent is that it looks good on your resume.
Sometimes an employer pays a good bonus - mine pays $5000 - for a patent.
Mostly, the writing up of the thing and dealing with the questions is more
trouble than it's worth - even for $5k! (I have to pay 40% tax on the $5k....)
You know you're getting old when you've got expired patents.
Amps mailing list