Granted Patent
Utility
US 5,605,940 · App. 08/387,642
High equivalent weight polyester polyols for closed cell, rigid foams
Inventors:
Michael J. Skowronski, Kenneth G. Trout
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: Feb 13, 1995
Inventors
Michael J. Skowronski
Kenneth G. Trout
Assignees (at issue)
Celotex Corporation
Apache Products Company
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.