Granted Patent
Utility
US 4,560,607 · App. 06/618,422
Method of joining materials by mechanical interlock and article
Inventor:
Earl C. Sumner
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: Jun 7, 1984
Inventor
Earl C. Sumner
Assignee (at issue)
The Duriron Company, 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.