Granted Patent
Utility
US 4,516,875 · App. 06/479,355
Concrete slab key joint forming strip and supporting stake therefor
Inventor:
Frank E. Turner
Patented Case
View Patent ↗
Granted: May 14, 1985
Filed: Mar 28, 1983
Inventor
Frank E. Turner
Assignee (at issue)
Burke, 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.