This is incorrect. In fact, the European Patent Register allows for modifying the details of a patent during the application process. Both the applicant and inventor list are allowed to be modified. Read up more on the patent process.
If you mean his name was removed from the list of Inventors on the patent, then that alone would be grounds for invalidating the patent. You don't get to be listed because of your status with the company that ends up owning the patent.
This in fact took place, for example, in this patent:
You get listed as an inventor because you were involved in the original invention. If an inventor is removed, or one listed who was not involved, on the final submission then that is very good grounds for contesting a patent.
You misunderstand the use of "inventor" in European patent law. In EU law, the "inventor" is not strictly the person responsible for the invention of the intellectual property, as it is in US patent law.
Thus, what happened in this patent ( https://register.epo.org/espacenet/application?number=EP07009545 ) is completely legal and fine in EU patent law. Dr Wang gave the rights to his intellectual property to Rauchless, the employees of which were able to then be listed as inventors. This right was transferred back to Wang and to Smokefree upon the dissolution of Rauchless.
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