Granted Patent
Utility
US 6,800,254 · App. 09/589,633
Visual indicator cold trapping system
Inventors:
Tue Nguyen, Craig Bercaw
Patented Case
View Patent ↗
Granted: Oct 5, 2004
Filed: Jun 7, 2000
Inventors
Tue Nguyen
Craig Bercaw
Assignee (at issue)
TEGAL 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.