"Daily Californian" discusses CRISPR patent matter
If the [UC] regents’ request for a patent interference is approved, both sides will argue before a panel over who first invented the CRISPR-Cas9 process. The ensuing legal battle could take years and cost millions of dollars, according to Greg Aharonian, director of the Center for Global Patent Quality, which advises clients on patent procedures.
In an interference, the party who filed an earlier patent application is called the "senior party".
The not-senior party bears the burden of proving that he or she is the first inventor.