Granted Patent
Utility
US 4,474,896 · App. 06/480,699
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Inventor:
Chien-Chung Chao
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Mar 31, 1983
Inventor
Chien-Chung Chao
Assignee (at issue)
Union Carbide Corporation
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.