Granted Patent
Utility
US 5,242,249 · App. 07/743,997
Pre-cast panel lifting insert
Inventor:
Boyd H. Grayson
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: Aug 12, 1991
Inventor
Boyd H. Grayson
Assignee (at issue)
MMI Products, Inc.
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.