USPTO trademark

C4 THERAPEUTICS

Opposition periodUSPTOWord markClass 5

"C4 THERAPEUTICS" is a word mark owned by C4 Therapeutics, Inc., filed at the USPTO on May 18, 2026. It is in its opposition period and covers class 5 (Pharmaceuticals).

View C4 Therapeutics, Inc. portfolioGet this data via the API
Official USPTO record
C4 THERAPEUTICS trademark as filed
As filed with the USPTO
Status
Opposition period
Since October 27, 2026
Filed
May 18, 2026
Registered
Not yet
Expires
Not recorded
Application no.
99829484
Registration no.
Not yet
Office
USPTO
United States Patent and Trademark Office
Mark type
Word mark
1 class
Ownership

Who owns C4 THERAPEUTICS

The owner on file, matched to the company behind it. Every owner-name spelling for that company is grouped on its page.

Owner

C4 Therapeutics, Inc.

CCCC · Watertown, United States

12 trademarks in the portfolioView company

Representative

Douglas R. Wolf

Wolf Greenfield & Sacks, P.C.

Goods and services

What the mark covers

The products and services C4 THERAPEUTICS is filed for, grouped by Nice class.

  • pharmaceutical preparations for the prevention and treatment of diseases and disorders, namely, cancer and tumors; pharmaceutical preparations for the treatment of immune system related diseases and disorders; pharmaceutical preparations for the treatment of neurodegeneration diseases and disorders

History

What has happened so far

Steps recorded by the USPTO, newest first.

  1. Official gazette publication confirmation e-mailed
  2. Published for opposition
  3. Notification of notice of publication e-mailed
  4. Approved for pub - principal register
  5. Notification of examiners amendment e-mailed
  6. Examiner's amendment entered
  7. Examiners amendment e-mailed
  8. Examiners amendment -written
  9. Assigned to examiner
  10. New application office supplied data entered

2 earlier steps on the official record.

FAQ

About C4 THERAPEUTICS

Who owns the trademark "C4 THERAPEUTICS"?

The USPTO trademark "C4 THERAPEUTICS" (application 99829484) is owned by C4 Therapeutics, Inc.

What is the status of "C4 THERAPEUTICS"?

Its status at the USPTO is: opposition period.

API

Get this data via the API

Everything on this page comes from the Signa API. Pull C4 THERAPEUTICS and marks like it into your own product with one request.

  • GET/v1/trademarks/{id}

    The full record: owners, classes, dates and images

  • GET/v1/trademarks/{id}/events

    Every step in the office history

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

    Oppositions and cancellations against the mark

Get API keyView docs
GET /v1/trademarks/{id}
ID=tm_019e43e8-4f0f-742d-b176-0122b90ac8c6
curl https://api.signa.so/v1/trademarks/$ID \
  -H "Authorization: Bearer $SIGNA_API_KEY"
Response
{
  "id": "tm_019e43e8-4f0f-742d-b176-0122b90ac8c6",
  "object": "trademark",
  "mark_text": "C4 THERAPEUTICS",
  "status": {
    "primary": "pending",
    "stage": "pending_opposition"
  },
  "office_code": "US",
  "application_number": "99829484",
  "filing_date": "2026-05-18",
  "nice_classes": [
    5
  ],
  "owners": [
    {
      "name": "C4 Therapeutics, Inc.",
      "entity_id": "ent_019eb709-bd9e-72cd-891d-0daf998100fc"
    }
  ]
}