ALEXANDRIA, Va., Oct. 26 -- Access Optics, Broken Arrow, Oklahoma, has been assigned a patent (9,795,279) developed by three co-inventors for an endoscope coupler. The co-inventors are Robert H. Hogrefe, Broken Arrow, Oklahoma, Thomas Mayer, Muskogee, Oklahoma, and John Hannam, Broken Arrow, Oklahoma. The abstract states: "An endoscope coupler with a split focus ring having direct engagement between the focus ring and the lens cell. The endoscope coupler may also have a changeable lens cartridge . . .