Granted Patent
Utility
US 4,417,425 · App. 05/767,880
Apparatus for erecting concrete wall panels
Inventors:
James E. Case, Richard L. Ruppert, Lindley Manning
Patented Case
View Patent ↗
Granted: Nov 29, 1983
Filed: Feb 11, 1977
Inventors
James E. Case
Richard L. Ruppert
Lindley Manning
Assignee (at issue)
DAYTON SUPERIOR 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.