A Diagnostic Patent Is Found Patent Eligible At The Federal Circuit

In March the Federal Circuit reversed a lower court decision finding Illumina's patents (U.S.Ps. 9,580,751 and 9,738,931) for diagnosing Down's Syndrome to be patent ineligible, 952 F.3d 1367 (Fed. Cir. 2020). On August 3, the Federal Circuit denied a petition for rehearing and rehearing enbanc but did issue a new decision adding the term 'human-engineered' in several portions of the opinion discussing the separation of fetal DNA from maternal DNA which the inventors had discovered were of different sizes, fetal cell DNA is shorter than the maternal DNA. The inventors recognized that the DNA to be analyzed for genetic aberrations was that of the fetus. The problem was to isolate the small amount of fetal DNA from the maternal DNA so the fetal DNA could be analyzed for genetic aberrations. Prior to the invention there was no known way to distinguish and separate maternal DNA from the tiny fraction of fetal DNA present. The inventors found that by selectively removing DNA having more than 500 or 300 base pairs they could produce a sample where the fetal DNA content in the...