Granted Patent
Utility
US 4,810,685 · App. 07/090,341
Foam catalysts, method of manufacture and method of using
Inventors:
Martyn Vincent Twigg, William Maurice Sengelow
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Aug 28, 1987
Inventors
Martyn Vincent Twigg
William Maurice Sengelow
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.