Granted Patent
Utility
US 5,955,521 · App. 08/895,864
Ultra-violet stabilized polyvinyl chloride resins and methods to impart ultra-violet stabilization to polyvinyl chloride resins
Inventors:
Isaac Bernard Rufus, Hao A. Chen
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Jul 17, 1997
Inventors
Isaac Bernard Rufus
Hao A. Chen
Assignee (at issue)
MANNINGTON MILLS, INC.
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.