Granted Patent
Utility
US 5,354,053 · App. 08/086,617
Play ball
Inventors:
Donald Ratner, Paul Feinsinger, Frank Hsieh
Patented Case
View Patent ↗
Granted: Oct 11, 1994
Filed: Jul 1, 1993
Inventors
Donald Ratner
Paul Feinsinger
Frank Hsieh
Assignee (at issue)
Kransco
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.