Granted Patent
Utility
US 4,527,413 · App. 06/535,064
Apparatus for drawing heavy wall shells with a multi-step inside edge
Inventors:
John D. Budrean, John A. Kirkpatrick
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Sep 23, 1983
Inventors
John D. Budrean
John A. Kirkpatrick
Assignee (at issue)
Verson Allsteel Press Company
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.