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Number of patents in a classification

Trying to establish how many patents have been issued in the U.S. for a certain classification, it seems not straightforward to get just that. As a case in point, pick classification 715/234. The ...
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Is there ex parte reexamination statistics narrowed to software patents only?

uspto.gov publish statistics quarterly, but the numbers are averaged from all industries and fields. I am trying to figure out whats chances a software patent had in 2011/2012 to go through a ex parte ...