As a scientist I have tried to replicate many expired patent filings to come up with new products (most patents are never used, much less make money).
Off the top of my head I guess half of the experiments described in the patent literature can be successfully replicated.
Some are complete and utter BS. Why someone spent money to file is beyond me (unless some were simply blocking patents).
“Science is facing a “reproducibility crisis” where more than two-thirds of researchers have tried and failed to reproduce another scientist’s experiments, research suggests.”
https://www.bbc.com/news/science-environment-39054778