Granted Patent
Utility
US 4,741,789 · App. 06/921,023
Apparatus and process for forming and applying a profile and adjacent rib-type zipper to a traveling film web
Inventors:
Larry M. Zieke, James Michael Trombley
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Oct 20, 1986
Inventors
Larry M. Zieke
James Michael Trombley
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.