Granted Patent
Utility
US 4,684,668 · App. 07/012,761
Process for producing porous spherical polyvinyl chloride particles
Inventor:
Roman B. Hawrylko
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Feb 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.