Granted Patent
Utility
US 4,033,892 · App. 05/593,494
Electric field responsive fluids
Inventor:
James E. Stangroom
Patented Case
View Patent ↗
Granted: Jul 5, 1977
Filed: Jul 7, 1975
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.