Celanese v. ITC: Can a Secret Manufacturing Process Be Patented After Sale of the Resulting Product?
Patently-O
MARCH 4, 2024
In 2016, over a year after it began selling Ace-K, Celanese filed patent applications on its heretofore secret Ace-K process. The “on-sale bar” was the statutory hook that prevented an inventor from commercially exploiting a secret invention for several years and then also obtaining a patent monopoly.
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