You can't be serious. My research shows that Ingen owns the trademark "Oxyview" as follows:
Registered Trademarks:
BAFI® on November 21, 2000 registration no. 2,406,214
OxyAlert® on April 4, 2006, registration no. 3,076,716
GasAlert® on April 11, 2006, registration no. 3,079,488
Oxyview® on May 20, 2008, registration no. 3,433,217
Secure Balance® April 12, 2009 registration no. 77-405551
Smart Nasal Cannula® February 18, 2010 Pending serial number 77,962,717
INGEN Pulse Oximeter® February 18, 2010 Pending serial number 77,962,724
Ingen did want the Oxyview Nasal Cannula, but it was too conflicting with Oxy-View glasses manufactured by another company who filed a complaint (not a law suit) and Ingen came up with a much better trademark "SMART Nasal Cannula".
You are very very wrong with your assumption on INGEN Pulse Oximeter. Ask me why and I'll tell you !