Granted Patent
Utility
US 5,143,438 · App. 07/774,314
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Inventors:
Len Giddens, John C. White, John G. Holden
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Oct 10, 1991
Inventors
Len Giddens
John C. White
John G. Holden
Assignee (at issue)
Thorn EMI plc
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.