ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,761, issued on June 17, was assigned to Deere & Co. (Moline, Ill.).

"Recycling secondary reservoir" was invented by Brett D. McClain (Hudson, Iowa), Benjamin E. Shores (Cedar Falls, Iowa) and Marcus L. Kuhl (Cedar Falls, Iowa).

According to the abstract* released by the U.S. Patent & Trademark Office: "A recycling secondary reservoir of a hydraulic system is charged with clean fluid from a primary hydraulic circuit. The secondary reservoir maintains clean fluid for use by a backup pump to cycle a hydraulic device. The secondary reservoir recaptures fluid used by the backup pump to maintain clean fluid that can be reused an indefinite number of times."

The patent was filed on Oct...