Granted Patent
Utility
US 4,688,366 · App. 06/889,242
Thermal barrier hollow or construction element
Inventor:
Dietrich Schmidt
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Jul 25, 1986
Inventor
Dietrich Schmidt
Assignee (at issue)
Capitol Products Corporation
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.