Q: When there are 2 entities under Assignee, for example "X, Y" Can X use the patent independently from Y or needs agrment
It depends on the agreement between the entities. Unfortunately, there's no way to know what each entity is permitted to do based on the text printed on the first page of the patent. For example, if the patent was sold, the Assignees listed on the front page would not be updated to reflect the change in ownership. If you can confirm that X and Y are the present owners, the next step would be to get the agreement to see what each entity is permitted to do.
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