Granted Patent
Utility
US 4,916,012 · App. 07/309,959
Cement reinforcing fiber
Inventors:
Takeo Sawanobori, Yuji Noguchi, Hiromichi Sakai, Kazuhiro Sone
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Feb 9, 1989
Inventors
Takeo Sawanobori
Yuji Noguchi
Hiromichi Sakai
Kazuhiro Sone
Assignee (at issue)
Mitsubishi Kasei Corporation
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.