Granted Patent
Utility
US 6,295,691 · App. 09/520,635
Vapor cleaning device
Inventor:
Chung-Ming Chen
Patented Case
View Patent ↗
Granted: Oct 2, 2001
Filed: Mar 7, 2000
Inventor
Chung-Ming Chen
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.