Granted Patent
Utility
US 4,843,775 · App. 07/252,111
Square butt door frame and method of assembly
Inventors:
Laurence P. Armstrong, Scott A. Libby, James L. Peterson, Roger Norberg
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Oct 3, 1988
Inventors
Laurence P. Armstrong
Scott A. Libby
James L. Peterson
Roger Norberg
Assignee (at issue)
Nichols-Homeshield, 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.