Granted Patent
Utility
US 4,129,513 · App. 05/760,977
Electric field responsive fluids
Inventor:
James E. Stangroom
Patented Case
View Patent ↗
Granted: Dec 12, 1978
Filed: Jan 21, 1977
Inventor
James E. Stangroom
Assignee (at issue)
The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
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.