Granted Patent
Utility
US 5,038,804 · App. 07/303,223
Smoking device
Inventors:
Li-Chung Chao, Jiunn-Yann Tang
Patented Case
View Patent ↗
Granted: Aug 13, 1991
Filed: Jan 30, 1989
Inventors
Li-Chung Chao
Jiunn-Yann Tang
Assignee (at issue)
Brown & Williamson Tobacco 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.