Granted Patent
Utility
US 4,229,547 · App. 06/021,399
Method of preparing spherical porous bead-type polymers
Inventors:
Louis Cohen, Pijus K. Basu
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Mar 19, 1979
Inventors
Louis Cohen
Pijus K. Basu
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.