Can a patent be invalidated for containing multiple inventions?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-27 7 Rules 4 Related FAQs This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice. No, a patent cannot be invalidated solely for containing multiple inventions. MPEP 805 clarifies this point, citing the last sentence of 35 U.S.C. 121 : “In other words, under this statute, no patent can be held invalid for improper joinder of inventions claimed therein.” This provision protects patent holders from challenges to their patent’s validity based on the USPTO’s decision not to require a restriction of the application to a single invention. Related Rules from the Manual of Patent Examining Procedure 7 rules Collapse Patent Validity Not Questioned for Improper Joinder of Inventions MPEP 805 Permitted Patent Validity Not Questioned for Improper Joinder MPEP 805 Prohibited Patent Not Invalidated for Unrestricted Inventions MPEP 804 Prohibited Restriction of Interfering Claims Is Permitted MPEP 2303 Permitted Restriction of Unpatentable Claims Not Ordinarily Appropriate MPEP 2303 Petition for Improper Restriction Not Timely Filed Is Treated as Cancellation MPEP 710.02(c) Recommended Combining Multiple Inventions into One Application MPEP 803.03 Other Related FAQs 4 FAQs Collapse What protection does 35 U.S.C. 121 provide to patent holders regarding improper joinder? What does 35 U.S.C. 121 say about patent validity and restriction requirements? What is the effect of improper joinder on patent validity? How does MPEP 805 interpret the last sentence of 35 U.S.C. 121?