ross M,
Read my post #26 regarding patent ownership. So far, Boeing has been silent on this. The original patent probably has been updated that gives it more life.
Notso Fantastic,
Your quote: Their benefit is cruise only, which is why really shorthaul operators don't invest in them.
Southwest Airlines in the US tends to be more of a short haul, regional airline, but does have some longer flight segments. They have a fleet of 550 Boeing 737s of which more than 80% are equipped with blended winglets. They are also the most profitable airlines in the US, generally. I am sure they believe every little bit helps and reducing fuel consumption is on top of their cost savings list.
TD