Granted Patent
Utility
US 4,452,928 · App. 06/440,154
Additive-containing polyolefin beads and process for their preparation
Inventors:
Charles A. Trischman, Paula S. Weissberger, Robert STEINERT
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Nov 8, 1982
Inventors
Charles A. Trischman
Paula S. Weissberger
Robert STEINERT
Assignee (at issue)
El Paso Polyolefins 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.