Granted Patent
Utility
US 6,508,694 · App. 09/761,336
Multi-zone pressure control carrier
Inventor:
Nikolay Korovin
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Jan 16, 2001
Inventor
Nikolay Korovin
Assignee (at issue)
SpeedFam-IPEC 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.