Granted Patent
Utility
US 4,289,912 · App. 06/146,945
Stabilization of liquid paraformaldehyde
Inventors:
Marvin E. Harris, Jr., Hubert H. Thigpen
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: May 2, 1980
Inventors
Marvin E. Harris, Jr.
Hubert H. Thigpen
Assignee (at issue)
Celanese GmbH
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.