Granted Patent
Utility
US 4,230,877 · App. 06/022,749
Method for increasing the 4,4'dicarbamate isomer of the diphenylmethane dicarbamates during preparation thereof
Inventors:
Edward T. Shawl, Gerald A. Bullano
Patented Case
View Patent ↗
Granted: Oct 28, 1980
Filed: Mar 22, 1979
Inventors
Edward T. Shawl
Gerald A. Bullano
Assignee (at issue)
Atlantic Richfield 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.