Granted Patent
Utility
US 4,264,673 · App. 06/149,113
Oriented cell polyisocyanurate foam laminate
Inventors:
Daniel J. Breidenbach, Stephen A. Knis
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: May 12, 1980
Inventors
Daniel J. Breidenbach
Stephen A. Knis
Assignee (at issue)
The Upjohn 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.