Is there a PID for patents (standardised format for patent numbers, copyright licenses). If not, is it something worth considering ?
At Crossref we’ve done a bit of work with Cambia/The Lens in the past: https://www.lens.org/. We haven’t got as far as PIDs for patents although I do know that there has been interest in this from some of our members (IEEE, ACM etc.)
We also get a feed of citations to patents in Event Data from The Lens (https://www.eventdata.crossref.org/guide/data/about-the-data/#sources-and-agents), although I don’t think we’ve had an updated feed of data from The Lens in some time.
Sorry nothing more concrete at this point but there is interest!