Till now there is No filing for IPR for these 2 patents.

From Interparte review of patent 831,1522

Mandatory notice by Patent owner e.DIGITAL

Before Kevin F. Turner , Hyun J. Jung , and Barbara A. Parvis

administrative patent judges Have been granted as US patent 9002331 “331” and patent 9178983 the “983” patent respectively and are thus no longer Subject to “ Administrative proceeding” at this time.

The “331” patent is a continuation of the subject “522” patent and The “983” patent is a continuation of the subject “618” patent.