What defenses can be considered in patent arbitration proceedings?

In patent arbitration proceedings, the defenses provided under 35 U.S.C. 282 must be considered by the arbitrator if raised by any party. This is specified in 35 U.S.C. 294(b):

‘In any such arbitration proceeding, the defenses provided for under section 282 shall be considered by the arbitrator if raised by any party to the proceeding.’

These defenses typically include noninfringement, absence of liability for infringement, unenforceability, and invalidity of the patent or any claim in suit.