Granted Patent
Utility
US 4,335,231 · App. 06/251,007
Sulfur curable millable polyurethane gum
Inventor:
Ajaib Singh
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Apr 3, 1981
Inventor
Ajaib Singh
Assignee (at issue)
Uniroyal Ltd.
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.