Who can grant access to inspect a pending or abandoned patent application filed on or after September 16, 2012?

For applications filed on or after September 16, 2012, the following parties can provide written authority to grant access to inspect a pending or abandoned application kept in confidence under 35 U.S.C. 122(a), except as provided in 37 CFR 1.11, 1.14, 41.6, or 42.412:

1. The applicant
2. A patent practitioner of record
3. The assignee or an assignee of an undivided part interest
4. The inventor or a joint inventor