Granted Patent
Utility
US 4,833,010 · App. 07/189,202
Composite chemical barrier fabric
Inventor:
John D. Langley
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: May 2, 1988
Inventor
John D. Langley
Assignee (at issue)
Kappler Safety Group
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.