Questions tagged [us5129654]
The us5129654 tag has no usage guidance.
1
question
1
vote
3answers
837 views
Can a patent filed more than 20 years ago still be valid?
I'm asking in particular about this patent.
The filing year was 1991, so it is currently 23 years old. However, the fee status says "paid." Google Patents also does not mention anything about that ...
