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I wonder if Twitter will retroactively apply this to the "pull to refresh" patent they acquired when they purchased the Tweetie and turned it into the official Twitter client:

http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sec...




They will. From the announcement (http://engineering.twitter.com/2012/04/introducing-innovator...):

> We will implement the IPA later this year, and it will apply to all patents issued to our engineers, both past and present.


Tweetie's developer is indicating this applies to pull-to-refresh: https://twitter.com/lorenb/status/192298232968249344


See this tweet from Twitter Comms: https://twitter.com/mgrooves/status/192303330876334082


We will implement the IPA later this year, and it will apply to all patents issued to our engineers,

which is different than the acquired patent you mention, but at least indicates the intention to make the policy retroactive.


That's not a patent, it's an unreviewed patent application.


On a related note, Gmail's mobile client uses "pull to refresh".




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