Granted Patent
Utility
US 5,137,950 · App. 07/765,409
3-9-diphosphaspiroundecanes and process for making 3-9-diphosphaspiroundecanes
Inventors:
Stephen J. Hobbs, Kevin J. Sheehan, William P. Enlow
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Sep 25, 1991
Inventors
Stephen J. Hobbs
Kevin J. Sheehan
William P. Enlow
Assignee (at issue)
Borg-Warner Specialty Chemicals, Inc.
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.