Granted Patent
Utility
US 4,137,377 · App. 05/843,470
Maintenance-free lead-acid cell
Inventor:
Donald H. McClelland
Patented Case
View Patent ↗
Granted: Jan 30, 1979
Filed: Oct 19, 1977
Inventor
Donald H. McClelland
Assignee (at issue)
The Gates Rubber Company
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.