There are many requirements for obtaining a patent.  One of those is the written description requirement.  Pursuant to 35 U.S.C. §112(a), the patent must describe the invention in writing.  If the written description requirement is not met, the patent won’t be granted.  If the patent has already been issued, it can be invalidated for failure to satisfy the written description requirement.  Recently, in Juno Therapeutics, Inc. v. Kite Pharma, Inc., 2021 U.S. App. LexIs 25706 (Fed. Cir. 2021), a damage award of $1.2 billion for patent infringement was reversed for just this reason.
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