PTAB AIA Proceedings
The USPTO does not provide a capacity to search PTAB AIA proceedings (IPR, PGR, CBM, and DER proceedings) by the name of the representing attorney or law firm. However, DocketNavigator, a third party service, allows searching by law firm.
As of 2/2016, a search on DocketNavigator shows the following PTAB AIA proceedings associated with the Neifeld law firm: