Granted Patent
Utility
US 4,299,993 · App. 06/126,223
Method for increasing the primary hydroxyl end groups in polyethers
Inventors:
Tristram W. Bethea, Shingo Futamura
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Mar 3, 1980
Inventors
Tristram W. Bethea
Shingo Futamura
Assignee (at issue)
The Firestone Tire & Rubber 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.