Granted Patent
Utility
US 4,737,538 · App. 06/782,748
Polymer concrete compositions
Inventors:
Walter M. Halper, Carl L. Willis
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Sep 30, 1985
Inventors
Walter M. Halper
Carl L. Willis
Assignee (at issue)
SHELL OIL 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.