Opposition · USPTO

Opposition 91311351

PendingUSPTO

Opposition 91311351 at USPTO between Hongxi Zhang and C.I. Naturmega S.A., over the mark CELLENZA, filed Oct 23, 2026. Status in the office record: pending.

View CELLENZAGet this data via the API
Status
Pending
Filed
Oct 23, 2026
Marks involved
1
Parties

Who is involved

The parties as named in the office record.

Opponent

Hongxi Zhang

Respondent

C.I. Naturmega S.A.

Timeline

How the case has moved

Dates from the USPTO record and the CELLENZA filing.

  1. CELLENZA filed

    Application 50021996 filed at the USPTO.

  2. Opposition filed

    Hongxi Zhang started opposition 91311351 at USPTO against CELLENZA.
  3. Next

    Awaiting decision

    No decision is recorded at USPTO yet.
Marks

Marks involved

1 contested mark.

MarkRoleApplicationOffice
CELLENZAContested50021996USPTO
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_01a65f54-3f21-47e8-9624-ec4fe51be010
curl https://api.signa.so/v1/proceedings/$ID \
  -H "Authorization: Bearer $SIGNA_API_KEY"
Response
{
  "id": "prc_01a65f54-3f21-47e8-9624-ec4fe51be010",
  "object": "proceeding",
  "proceeding_type": "opposition",
  "proceeding_number": "91311351",
  "status": "pending",
  "office_code": "US",
  "filed_date": "2026-10-23",
  "parties": [
    {
      "name": "HONGXI ZHANG",
      "role": "opponent"
    },
    {
      "name": "C.I. Naturmega S.A.",
      "role": "respondent"
    }
  ]
}