Granted Patent
Utility
US 4,337,157 · App. 05/887,573
Biopolymer filtration process
Inventor:
Timothy Bradley
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Mar 17, 1978
Inventor
Timothy Bradley
Assignee (at issue)
Manville Service 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.