Edit: Since there is curiosity about the claims, here's the application:
As an aside, I thought all that's required for that kind of defense is a provisional application. And if you really want it to pass into the public domain, you can simply let a year lapse without completing application.
Is that right? I'm not an expert and I've never patented anything. Maybe it's better to actually get the patent.
This also might explain why Apple isn’t busy updating Mail on iPhone to also use pull-to-refresh…