Granted Patent
Utility
US 4,919,992 · App. 07/214,391
Process for making microporous products and the products thereof
Inventors:
David J. Blundell, Frederic N. Cogswell, Peter J. Meakin
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Jul 1, 1988
Inventors
David J. Blundell
Frederic N. Cogswell
Peter J. Meakin
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.