Granted Patent
Utility
US 5,252,253 · App. 07/721,440
Phenyl naphthalenes having liquid crystalline properties
Inventors:
George W. Gray, Kenneth J. Toyne, David Lacey, Michael Hird
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Jul 16, 1991
Inventors
George W. Gray
Kenneth J. Toyne
David Lacey
Michael Hird
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.