ALEXANDRIA, Va., April 21 -- United States Patent no. 12,607,128, issued on April 21, was assigned to RTX Corp. (Farmington, Conn.).

"Composite fan blade leading edge sheath with encapsulating extension" was invented by Nicholas D. Stilin (Higganum, Conn.) and Darin S. Lussier (Guilford, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A metallic sheath for a composite fan blade includes a body comprising a leading edge portion configured to cover a leading edge of the blade; a top surface adjacent the leading edge; an extension portion proximate the top surface configured to cover a portion of a tip of the blade along an intermediate chord length; an encapsulation portion opposite the top surface config...