Granted Patent
Utility
US 4,589,240 · App. 06/651,936
Foam core panel with interlocking skins and thermal break
Inventors:
William Kendall, Richard Smith, William F. Wadsworth
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Sep 19, 1984
Inventors
William Kendall
Richard Smith
William F. Wadsworth
Assignee (at issue)
Raynor Mfg. 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.