Granted Patent
Utility
US 5,531,537 · App. 08/274,396
Cylindrical key and slot coupling
Inventors:
Edward N. Pink, Michael F. Johnson
Patented Case
View Patent ↗
Granted: Jul 2, 1996
Filed: Jul 12, 1994
Inventors
Edward N. Pink
Michael F. Johnson
Assignee (at issue)
Edelbrock, LLC
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.