Granted Patent
Utility
US 4,239,916 · App. 05/956,293
Isocyanurate foam catalyst
Inventors:
Robert L. Zimmerman, Edward E. McEntire, Howard P. Klein
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Oct 30, 1978
Inventors
Robert L. Zimmerman
Edward E. McEntire
Howard P. Klein
Assignee (at issue)
Texaco Development 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.