Granted Patent
Utility
US 5,967,664 · App. 09/138,496
Sift proof valve bag
Inventors:
Don G. Giles, Robert G. Kelley
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Aug 24, 1998
Inventors
Don G. Giles
Robert G. Kelley
Assignee (at issue)
Stone Container 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.