Composition of Matter 1 topic · 1 source Law› Intellectual PropertyPatentAn invention in which the substance and not the form or shape is the inventive subject matter. Under U.S. law, one of the statutory classes of inventions. 35 U.S.C. 101 MPEP 2105, MPEP 2106.Robert M. Hunter, Ph.D. — Glossary of Patent Terms Cite