ALEXANDRIA, Va., March 10 -- 3M Innovative Properties, St. Paul, Minnesota, has been assigned a patent (9,907,733) developed by eight co-inventors for "dental compositions comprising addition-fragmentation agents." The co-inventors are Guy D. Joly, Shoreview, Minnesota, Ahmed S. Abuelyaman, Woodbury, Minnesota, Bradley D. Craig, Lake Elmo, Minnesota, Afshin Falsafi, Woodbury, Minnesota, Joel D. Oxman, Minneapolis, Minnesota, Larry R. Krepski, White Bear Lake, Minnesota, William H. Moser, Edina, . . .