Granted Patent
Utility
US 4,412,088 · App. 06/300,786
Cyclopentadiene derivatives, method for preparing, and use thereof
Inventors:
Bruce A. Gruber, Diether Koch, Heimo J. Langer, William R. Dunnavant
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: Sep 10, 1981
Inventors
Bruce A. Gruber
Diether Koch
Heimo J. Langer
William R. Dunnavant
Assignee (at issue)
Ashland Oil, 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.