Granted Patent
Utility
US 4,239,679 · App. 06/052,458
High bulk density rigid poly(vinyl chloride) resin powder composition and preparation thereof
Inventors:
James A. Rolls, IV, Kenneth L. Brenis
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Jun 27, 1979
Inventors
James A. Rolls, IV
Kenneth L. Brenis
Assignee (at issue)
Diamond Shamrock Corporation
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.