Granted Patent
Utility
US 4,874,829 · App. 07/053,222
Process for preparing .alpha.-methylstyrene-acrylonitrile polymers
Inventors:
Chris E. Schwier, Wan C. Wu
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: May 22, 1987
Inventors
Chris E. Schwier
Wan C. Wu
Assignee (at issue)
Monsanto 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.