Granted Patent
Utility
US 6,429,316 · App. 09/447,237
Process for preparing pyrrolidone derivative
Inventors:
Kazunari Takahashi, Yoko Seto, Masaru Utsunomiya, Souichi Orita, Kazutaka Maruyama, Tomonori Okubi
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: Nov 23, 1999
Inventors
Kazunari Takahashi
Yoko Seto
Masaru Utsunomiya
Souichi Orita
Kazutaka Maruyama
Tomonori Okubi
Assignee (at issue)
MITSUBISHI CHEMICAL 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.