In short, it is a written summary of an oral interview conducted with a U.S. Patent Examiner.
"Substance of Interview" rules are more specifically described in MPEP 713.04 and 337 C.F.R. 1.133(b):
MPEP 713.04
"A complete written statement as to the substance of any in-person, video conference, electronic mail, telephone interview, or electronic message system discussion with regard to the merits of an application must be made of record in the application, whether or not an agreement with the examiner was reached at the interview. The requirement may be satisfied by submitting a transcript generated during an electronic mail or message exchange."
"It is the responsibility of the applicant or the attorney or agent to make the substance of an interview of record in the application file, except where the interview was initiated by the examiner and the examiner indicated on the “Examiner Initiated Interview Summary” form (PTOL-413B) that the examiner will provide a written summary. It is the examiner’s responsibility to see that such a record is made and to correct material inaccuracies which bear directly on the question of patentability."
37 C.F.R. 1.133 Interviews
"Substance of Interview" rules are more specifically described in MPEP 713.04 and 337 C.F.R. 1.133(b):
MPEP 713.04
"A complete written statement as to the substance of any in-person, video conference, electronic mail, telephone interview, or electronic message system discussion with regard to the merits of an application must be made of record in the application, whether or not an agreement with the examiner was reached at the interview. The requirement may be satisfied by submitting a transcript generated during an electronic mail or message exchange."
"It is the responsibility of the applicant or the attorney or agent to make the substance of an interview of record in the application file, except where the interview was initiated by the examiner and the examiner indicated on the “Examiner Initiated Interview Summary” form (PTOL-413B) that the examiner will provide a written summary. It is the examiner’s responsibility to see that such a record is made and to correct material inaccuracies which bear directly on the question of patentability."
37 C.F.R. 1.133 Interviews
- (b) In every instance where reconsideration is requested in view of an interview with an examiner, a complete written statement of the reasons presented at the interview as warranting favorable action must be filed by the applicant. An interview does not remove the necessity for reply to Office actions as specified in §§ 1.111 and 1.135.