Granted Patent
Utility
US 5,344,998 · App. 08/145,668
Preparation of bis(fluoromethy)ether and difluoromethane
Inventors:
John Martin, Thomas Anthony Ryan, Rachel A. Spooncer
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: Nov 4, 1993
Inventors
John Martin
Thomas Anthony Ryan
Rachel A. Spooncer
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.