Granted Patent
Utility
US 4,024,691 · App. 05/584,480
Corner key reinforcement brace
Inventors:
Barton G. Hansen, Charles P. Goetz, John A. Gasper
Patented Case
View Patent ↗
Granted: May 24, 1977
Filed: Jun 6, 1975
Inventors
Barton G. Hansen
Charles P. Goetz
John A. Gasper
Assignee (at issue)
Roblin Industries, 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.