ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,346, issued on Feb. 17, was assigned to PRATT & WHITNEY CANADA CORP. (Longueuil, Canada).

"Gas turbine engine with rotational spool balancing system" was invented by Bruce Calvert (Burlington, Canada), Ronald L. Robinson (Brampton, Canada), Dave Menheere (Norval, Canada) and David Beamish (Mississauga, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "A gas turbine engine is provided that includes a combustor, a rotational spool, a spool balancing system, and at least one access port. The rotational spool includes turbine and compressor sections, and a shaft that connects the turbine and compressor sections. The spool balancing system includes a...