ALEXANDRIA, Va., Aug. 20 -- Electrochemical Oxygen Concepts, San Antonio, has been assigned a patent (9,730,838) developed by seven co-inventors for an "apparatus and methods for controlling tissue oxygenation for wound healing and promoting tissue viability." The co-inventors are Michael C. Wells, San Antonio, Mark Parker, Houston, Daniel J. Clarius, Missouri City, Texas, Andrew Parker, Missouri City, Texas, Faraidoon Pundole, Sugar Land, Texas, Tom Woods, Friendswood, Texas, and Mark Niederaue . . .