Granted Patent
Utility
US 6,494,639 · App. 09/301,682
Primary connector for pre-cast structures
Inventor:
Cliff Friend
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: May 1, 1999
Inventor
Cliff Friend
Assignee (at issue)
Universal Services, 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.