ALEXANDRIA, Va., Aug. 26 -- United States Patent no. RE50,552, issued on Aug. 26, was assigned to HENGST SE (Munster, Germany).
"Filter with a replaceable filter insert" was invented by Wilhelm Ardes (Ascheberg, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fluid filter with a housing, a releasable cover, and a replaceable filter having a filter body and two end discs. The filter is plugged onto a housing pipe and a locking ring is guided on the pipe, preloaded in a push-out direction. The locking ring is locked in a pushed-out position by a locking device. An unlocking device guided by the filter unlocks the locking device when the filter is pushed onto the pipe and enables the locking ring and t...