Granted Patent
Utility
US 4,969,952 · App. 07/405,600
Release agent for urethane foam molding
Inventors:
Thomas Hattich, William P. Krug, Gerhard Schuster
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Sep 11, 1989
Inventors
Thomas Hattich
William P. Krug
Gerhard Schuster
Assignee (at issue)
Grace Service Chemicals GmbH
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.