Notable cases

Yankwich tried Cain v. Universal Pictures (1942), a case in which the writer James M. Cain sued Universal Pictures, the scriptwriter and the director for copyright infringement in connection with the film When Tomorrow Comes. Cain claimed a scene in his book where two protagonists take refuge from a storm in a church had been copied in a scene depicting the same situation in the movie. Yankwich ruled that there was no resemblance between the scenes in the book and the film other than incidental scènes à faire, or natural similarities due to the situation, establishing an important legal precedent.^[2]

Yankwich decided several important cases involving racial minorities. He invalidated segregation in Lopez v. Seccombe (1944), a decision prohibiting discrimination against persons of Mexican ancestry in San Bernardino's public recreational facilities.^[3] In Uyeno v. Acheson (1951), he held that a birthright citizen had not been expatriated by voting in an election in Occupied Japan in 1947: "In the present case, the testimony of the plaintiff is that the constant reiteration through newspapers and over the radio, and by friends and advisers of the importance of voting and the need for voting was taken by him as 'a command' on the part of General MacArthur and the Occupation Forces to vote, which he could not, with impunity, disobey. Indeed, he testified that, in addition to this, he was led to believe that if he did not vote, he would lose his food ration card."^[4]