Manual of Patent Examining Procedure - MPEP

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800 Restriction in Applications Filed Under 35 U.S.C. 111; Double Patenting

805 Effect of Improper Joinder in Patent

35 U.S.C. 121, last sentence, provides "the validity of a patent shall not be questioned for failure of the Director to require the application to be restricted to one invention." In other words, under this statute, no patent can be held void for improper joinder of inventions claimed therein.

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