Opposition · USPTO

Opposition 91309551

PendingUSPTO

Opposition 91309551 at USPTO between Rhythm Pharmaceuticals, Inc. and Arian Sattari-Khavas, over the mark RITMO, filed Aug 11, 2026. Status in the office record: pending.

View RITMOGet this data via the API
Status
Pending
Filed
Aug 11, 2026
Marks involved
4
Parties

Who is involved

The parties as named in the office record.

Opponent

Rhythm Pharmaceuticals, Inc.

Company trademarks
Respondent

Arian Sattari-Khavas

Timeline

How the case has moved

Dates from the USPTO record and the RITMO filing.

  1. RITMO filed

    Application 99364881 filed at the USPTO.

  2. Opposition filed

    Rhythm Pharmaceuticals, Inc. started opposition 91309551 at USPTO against RITMO.
  3. Next

    Awaiting decision

    No decision is recorded at USPTO yet.
Marks

Marks involved

1 contested mark, 3 marks the challenger relies on.

MarkRoleApplicationOffice
RITMOContested99364881USPTO
RHYTHMRelied on77934236USPTO
RHYTHMRelied on88421834USPTO
RHYTHM PHARMACEUTICALS PIONEERING A PATH FORWARDRelied on98195639USPTO
API

Get this data via the API

Every fact on this page comes from the Signa API. Track oppositions and cancellations on any mark with one request.

  • GET/v1/proceedings/{id}

    Parties, dates, outcome and every mark in the case

  • GET/v1/proceedings?trademark_id={trademark_id}

    Every proceeding on a mark

Get API keyView docs
GET /v1/proceedings/{id}
ID=prc_d86f0ad6-5b6f-4b9b-8e71-168f9c787a75
curl https://api.signa.so/v1/proceedings/$ID \
  -H "Authorization: Bearer $SIGNA_API_KEY"
Response
{
  "id": "prc_d86f0ad6-5b6f-4b9b-8e71-168f9c787a75",
  "object": "proceeding",
  "proceeding_type": "opposition",
  "proceeding_number": "91309551",
  "status": "pending",
  "office_code": "US",
  "filed_date": "2026-08-11",
  "parties": [
    {
      "name": "Rhythm Pharmaceuticals, Inc.",
      "role": "opponent"
    },
    {
      "name": "Arian Sattari-Khavas",
      "role": "respondent"
    }
  ]
}