Granted Patent
Utility
US 4,645,812 · App. 06/707,336
Method of suspension polymerization of vinyl chloride
Inventor:
Helmut K. Maier
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Mar 1, 1985
Inventor
Helmut K. Maier
Assignee (at issue)
Henkel Limited
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.