Granted Patent
Utility
US 4,445,357 · App. 06/203,271
Pipe press
Inventors:
Joseph E. Powers, Ranaldo H. Grimoldi, Calvin C. Williamson, Alfred A. Bottini
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Nov 3, 1980
Inventors
Joseph E. Powers
Ranaldo H. Grimoldi
Calvin C. Williamson
Alfred A. Bottini
Assignee (at issue)
Kaiser Steel 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.