Granted Patent
Utility
US 4,653,970 · App. 06/768,291
Quarter-turn fastener
Inventor:
David Ballantyne
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Aug 22, 1985
Inventor
David Ballantyne
Assignee (at issue)
Multifastener Corporation
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.