Granted Patent
Utility
US 4,755,539 · App. 07/107,427
Skinless porous particle PVC resin and process for producing same
Inventor:
Roman B. Hawrylko
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: Oct 6, 1987
Inventor
Roman B. Hawrylko
Assignee (at issue)
B. F. Goodrich 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.