Granted Patent
Utility
US 5,236,992 · App. 07/793,145
Carbon blacks and their use in rubber applications
Inventor:
Ted W. Bush
Patented Case
View Patent ↗
Granted: Aug 17, 1993
Filed: Nov 18, 1991
Inventor
Ted W. Bush
Assignee (at issue)
Cabot Corporation
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.