ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,497,857, issued on Dec. 16, was assigned to SPM Oil & Gas Inc. (Fort Worth, Texas).
"Valve assembly for wellhead" was invented by Andrew Hanson (Sherwood Park, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "A valve assembly for a wellhead includes a channel extending between a first end and a second end; a valve having a valve closed position in which the channel is blocked and a valve open position in which the channel is unblocked; and a flap arrangement having a flap closed position. The flap arrangement is configured to: displace from the flap closed position in an event of obstruction of the channel; and return to the flap closed position on...