I couldn't locate any obit in the Philadelphia Inquirer. Also was not able to locate a Patrick Mullen of the approximate age in Gloucester, NJ in 1920 census. By the way, Gloucester City, NJ is in Camden County NJ, not in Gloucester County. Confusing isn't it? I am guessing they are referring to the city and not the county below.
I am guessing you might have the following article also listed in the Trenton Times:
Feb 3, 1922 – Jersey Journal (Jersey City, NJ)
JERSEY MAN DIES AFTER AUTO CRASH:
New Brunswick, Feb 3, Patrick Mullen, 43 of Gloucester, died yesterday at St Peter’s Hospital of injuries received Wednesday night when his automobile collided with a trolley car.