Granted Patent
Utility
US 5,173,016 · App. 07/687,585
Apparatus and method for forming finger and thumb holes in bowling balls
Inventors:
John Ellison, Ronald F. Hoppe
Patented Case
View Patent ↗
Granted: Dec 22, 1992
Filed: Apr 17, 1991
Inventors
John Ellison
Ronald F. Hoppe
Assignee (at issue)
Pro Shops Unlimited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.