Granted Patent
Utility
US 4,518,026 · App. 06/479,741
Energy efficient garage door construction and the like
Inventors:
Ronald F. Otto, John J. Kempel
Patented Case
View Patent ↗
Granted: May 21, 1985
Filed: Mar 28, 1983
Inventors
Ronald F. Otto
John J. Kempel
Assignee (at issue)
Garland Manufacturing Co.
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.