Granted Patent
Utility
US 6,602,025 · App. 09/809,445
Process for lining canals, ditches and pipes with a non-sagging polyurethane/geofabric composite
Inventors:
Peter H. Markusch, Ralf Guether
Patented Case
View Patent ↗
Granted: Aug 5, 2003
Filed: Mar 15, 2001
Inventors
Peter H. Markusch
Ralf Guether
Assignee (at issue)
Bayer Aktiengesellschaft
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.