Granted Patent
Utility
US 4,715,897 · App. 06/862,695
Esters as pitch plasticizers
Inventors:
James A. Tallon, Richard T. Lewis
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: May 13, 1986
Inventors
James A. Tallon
Richard T. Lewis
Assignee (at issue)
Union Carbide 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.