Granted Patent
Utility
US 6,008,312 · App. 08/758,892
Method for producing millable polyurethanes and polyurethane elastomers
Inventor:
Hitoshi Shirasaka
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Dec 2, 1996
Inventor
Hitoshi Shirasaka
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.