Granted Patent
Utility
US 6,402,612 · App. 09/761,984
Column fan unit
Inventors:
Salman Akhtar, Ming Hui Han
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Jan 17, 2001
Inventors
Salman Akhtar
Ming Hui Han
Assignee (at issue)
Air Handling Engineering Ltd.
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.