Granted Patent
Utility
US 4,977,255 · App. 07/346,117
Steroidal 17.alpha.-silyl ethers and process to corticoids and progesterones
Inventors:
Douglas Alan Livingston, Bruce Allen Pearlman, Scott E. Denmark
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Apr 7, 1989
Inventors
Douglas Alan Livingston
Bruce Allen Pearlman
Scott E. Denmark
Assignee (at issue)
The Upjohn Co.
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.