Granted Patent
Utility
US 6,165,550 · App. 09/121,482
Symmetrical Polyurea-urethane fertilizer encapsulation
Inventors:
Peter H. Markusch, James W. Rosthauser
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Jul 23, 1998
Inventors
Peter H. Markusch
James W. Rosthauser
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.