Granted Patent
Utility
US 4,883,721 · App. 07/077,226
Multi-layer low emissivity thin film coating
Inventors:
Raymond Nalepka, Russell Huffer
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Jul 24, 1987
Inventors
Raymond Nalepka
Russell Huffer
Assignee (at issue)
Guardian Industries Corp.
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.