Granted Patent
Utility
US 6,442,980 · App. 09/835,168
Carbon dioxide dry cleaning system
Inventors:
A. Duane Preston, Jon R. Turner, Charles Svoboda
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Apr 13, 2001
Inventors
A. Duane Preston
Jon R. Turner
Charles Svoboda
Assignee (at issue)
Chart Inc.
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.