Patent Infringement. John and Andrew Doney invented a hard-bearing device for balancing rotors. Although they obtained a patent for their invention from the U.S. Patent and Trademark Office, it was never used as an automobile wheel balancer. Sometime later, Exetron Corp. produced an automobile wheel balancer that used a hard-bearing device with a support plate similar to that of the Doneys' device. Given that the Doneys had not used their device for automobile wheel balancing, does Exetron's use of a similar device infringe on the Doneys' patent? Why or why not?

Fair Use.Professor Wise is teaching a summer seminar in business torts at State University. Several times during the course, he makes copies of relevant sections from business law texts and distributes them to his students. Wise does not realize that the daughter of one of the textbook authors is a member of his seminar. She tells her father about Wise's copying activities, which have taken place without her father's or his publisher's permission. Her father sues Wise for copyright,