the patent # is 2321. The current # is for a euonymus plant. the patent states that zorina is a hybrid of a yellow seedling from Pinocchio x Spartan. It doesnt mention what the other parent with Pinocchio was.
I looked for more references about 10 times or so, but found nearly nothing. My best guess is that the unknown portion is a descendant of either Tawney Gold or Golden Masterpiece.