Granted Patent
Utility
US 4,386,189 · App. 06/260,828
Process for the post-chlorination of vinyl chloride polymers
Inventors:
Alfred J. Ackerman, David L. Lull
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: May 5, 1981
Inventors
Alfred J. Ackerman
David L. Lull
Assignee (at issue)
Delaware City Plastics 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.