Granted Patent
Utility
US 4,444,661 · App. 06/369,320
Filter device
Inventors:
Mark Jackson, Monty E. Vincent, Attila Vadnay
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Apr 16, 1982
Inventors
Mark Jackson
Monty E. Vincent
Attila Vadnay
Assignee (at issue)
Gelman Sciences
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.