Granted Patent
Utility
US 4,699,681 · App. 06/308,827
Method of making a gas phase permeable filter
Inventors:
James W. Kasmark, Jr., Myron L. Dooley, Arthur H. Jones
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Oct 5, 1981
Inventors
James W. Kasmark, Jr.
Myron L. Dooley
Arthur H. Jones
Assignee (at issue)
D-Mark, Inc.
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.