Granted Patent
Utility
US 5,344,629 · App. 07/921,210
Reducing Z.sub.20 emissions
Inventor:
Folke Engstrom
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: Jul 29, 1992
Inventor
Folke Engstrom
Assignee (at issue)
A. Ahlstrom 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.