Granted Patent
Utility
US 5,731,477 · App. 08/381,165
Method for synthesis of aryl difluoromethyl ethers
Inventors:
Joseph M. Karpinski, Siegfried B. Christensen, IV, Steven Dabbs
Patented Case
View Patent ↗
Granted: Mar 24, 1998
Filed: Jan 31, 1995
Inventors
Joseph M. Karpinski
Siegfried B. Christensen, IV
Steven Dabbs
Assignee (at issue)
SmithKline Beecham 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.