Granted Patent
Utility
US 4,304,589 · App. 06/164,693
Briquetted fertilizer for forest fertilization
Inventors:
Seiichi Kamo, Tetzuo Watanabe, Noriyasu Kuroda, Naoto Osako, Yoshinori Kaneko
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Jun 30, 1980
Inventors
Seiichi Kamo
Tetzuo Watanabe
Noriyasu Kuroda
Naoto Osako
Yoshinori Kaneko
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.