ALEXANDRIA, Va., June 12 -- United States Patent no. 12,297,673, issued on May 13, was assigned to Betts Industries Inc. (Warren, Pa.).
"Adjustable tamper-resistant locking mechanism for manhole cover" was invented by David Adams (Warren, Pa.), Michael Gustafson (Clarendon, Pa.) and Craig Culbertson (Russell, Pa.).
According to the abstract* released by the U.S. Patent & Trademark Office: "This disclosure includes a manhole cover locking device, system, and kit, each configured for locking a manhole cover in a closed position overtop an access opening of a container, the access opening being arranged at one end of a collar extending outwardly from the container, each comprising: a body; a mechanism for connecting the body to a pre-existin...