Harold “Pat” Patzelt, age 94, late of Oak Lawn, passed away on May 5, 2016. Beloved husband of the late Claire (nee Prendergast). Loving father of Charles (Mary Lynn Smith) Patzelt, Lawrence (Lucia) Patzelt,, Loretta (James) Kargol, Robert (Joan) Patzelt, Mark Patzelt, and Thomas (Lynne) Patzelt. Cherished grandfather of Julia (Richard), Edward, William (Katherine), Regina (Nicholas), Elizabeth (fiancé, Jonathan), Cristina (Andrew), Ellen, Diane, Emily (Christopher), Kevin, Michelle, David, and Lisa. Loving great-grandfather of Louis and Vincent. Fond brother-in-law of Raphael (Richard) Little and Josephine (James) Vogwill. Caring uncle of many nieces and nephews. Proceeded in death by siblings, Walter, Katherine, and Loretta. In lieu of flowers memorials made to The University of Chicago School of Medicine or St. Ignatius College Prep High School would be appreciated.