Granted Patent
Utility
US 4,461,899 · App. 06/381,070
Fluorenecarboxylic acid derivatives
Inventors:
William J. Pyne, Han San Ku, Robert E. Holm
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: May 24, 1982
Inventors
William J. Pyne
Han San Ku
Robert E. Holm
Assignee (at issue)
Diamond Shamrock Chemicals Company
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.