ALEXANDRIA, Va., June 5 -- United States Patent no. 12,275,580, issued on April 15.

"Floating roof secondary seal" was invented by Dave Vallee (Nisku, Canada) and Elias Lopez (Nisku, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "A secondary seal system for a storage tank having a floating roof includes a seal compression plate attached to and extending upwards at an oblique angle from the floating roof, extending around the circumference of the floating roof; a seal element attached to the compression plate for sealing between the compression plate and an inner surface of the storage tank; a plurality of anti-rollover plates attached to and extending upwards from the seal compression plate; and a plu...