Google wants to patent splitting the restaurant bill (news.cnet.com)

prior art :) - http://hitchhikers.wikia.com/wiki/Bistromatics

Google as patent troll. Fancy that.

Some other prior art:

Splitwise: http://splitwise.com (I'm the CEO) Billmonk (acquired by Billpin) http://billpin.com

or see this Quora thread for tons more: https://www.quora.com/What-are-some-replacements-for-BillMon...

Jon