Granted Patent
Utility
US 6,022,641 · App. 08/996,320
Non-aqueous electrolyte secondary cell
Inventors:
Takuya Endo, Kimio Takahashi
Patented Case
View Patent ↗
Granted: Feb 8, 2000
Filed: Dec 22, 1997
Inventors
Takuya Endo
Kimio Takahashi
Assignee (at issue)
SONY GROUP 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.