Granted Patent
Utility
US 4,427,748 · App. 05/642,798
Planar battery comprising a terminal plate having gas venting orifice covered with a layer of gas permeable material
Inventor:
Edwin H. Land
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Dec 22, 1975
Inventor
Edwin H. Land
Assignee (at issue)
Polaroid 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.