Granted Patent
Utility
US 5,221,570 · App. 07/753,817
Multilayered coextruded geomembrane
Inventors:
Cem M. Gokcen, Gary Kolbasuk
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Sep 3, 1991
Inventors
Cem M. Gokcen
Gary Kolbasuk
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.