Granted Patent
Utility
US 6,749,659 · App. 09/974,772
Controlled release rate fertilizers and methods of making same
Inventors:
Zhimin Yu, James B. Hyne, Mark Ernest Grist
Patented Case
View Patent ↗
Granted: Jun 15, 2004
Filed: Oct 9, 2001
Inventors
Zhimin Yu
James B. Hyne
Mark Ernest Grist
Assignee (at issue)
Enersul, Inc.
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.