Who funds his research? If he is funding it out of his own pocket then yes, I think it would be fair for him to have some joint ownership of the IP. However, if it was funded by someone else (e.g. the public) then my view is that everyone who contributed to funding that research should have the ability to access and use the results.
Who funds his research? If he is funding it out of his own pocket then yes, I think it would be fair for him to have some joint ownership of the IP. However, if it was funded by someone else (e.g. the public) then my view is that everyone who contributed to funding that research should have the ability to access and use the results.