@detlef, most countries do not have legal requirement to register ownership changes after the patent was/is granted. Whatever information that is available will be in the TLS231_INPADOC_LEGAL_EVENT table. Different countries use different codes, so you will need to look for the relevant event_codes ...

Quite some PATSTAT Register users have asked for extra information on the event codes and event text data which you can find in the reference table REG402_EVENT_TEXT . Factum is that we do not have much extra information then wat is available in the event_text field. But it might look a bit strange ...