An article published last month on Law360 (behind paywall) discusses recent developments in the law of patent eligibility, which is enforced through Section 101 of title 35. We have covered patent eligibility issues on this blog before in connection with diagnostic patents and patents on isolated DNA, and these posts (and others) have a great deal of helpful background information on the applicable law. By way of a brief recap, Section 101 limits patent eligibility to processes, machines, manufactures, and compositions of matter. The courts have held, however, that even if a patent claim nominally falls into one of these categories, the claim is not patent eligible if it is directed to a law of nature, a product of nature, or an abstract idea. The courts have recently explained that, to survive a patent eligibility challenge, the claim must be directed to an inventive application of a law of nature or abstract idea. And if the material is alleged to be a product of nature, it must be markedly different from the natural counterpart.
The authors of the article, Professor Bernard Chao of University of Denver Sturm School of Law and Lane Womack of Kilpatrick Townsend & Stockton LLP, briefly survey the landscape of Section 101 case law and go on to discuss a few patent applications that the U.S. Patent and Trademark Office (PTO) recently rejected on patent eligibility grounds. Although the highest-profile patents are those that have been the subject of court cases, Chao and Womack—though based on an “admittedly unscientific and small sample”—show how the law works on the ground.
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