US Patent Issued to SEWER SENTRY on Aug. 11 for "Extension pipe for manhole cover" (Louisiana Inventor)

ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,703,954, issued on Aug. 11, was assigned to SEWER SENTRY LLC (Calhoun, La.).

"Extension pipe for manhole cover" was invented by David Alan Putnam (West Monroe, La.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A manhole cover assembly for a sewer, the manhole cover assembly including a manhole cover having a top surface and a bottom surface. An opening extends through the manhole cover between the top surface and the bottom surface. The assembly further includes an extension pipe coaxially aligned with the opening of the manhole cover and extending from the top surface of the manhole cover, wherein the extension pipe is coupled to the manhole cover wit...