| Serial Number | 99598873 |
| Word Mark | XILIO |
| Filing Date | Friday, January 16, 2026 |
| Status | 686 - PUBLISHED FOR OPPOSITION |
| Status Date | Tuesday, June 16, 2026 |
| Registration Number | 0000000 |
| Registration Date | NOT AVAILABLE |
| Mark Drawing | 4 - Illustration: Drawing with word(s) / letter(s) / number(s) in Block form |
| Published for Opposition Date | Tuesday, June 16, 2026 |
| Goods and Services | Pharmaceutical products for the treatment of cancer, all of the foregoing excluding pharmaceutical products for sleep disorders, central nervous disorders other than cancers of the central nervous system, and neurological disorders other than cancers of the neurological system |
| International Class | 005 - Pharmaceutical and veterinary preparations; sanitary preparations for medical purposes; dietetic substances adapted for medical use, food for babies; plasters, materials for dressings; material for stopping teeth, dental wax; disinfectants; preparations for destroying vermin; fungicides, herbicides. |
| US Class Codes | 005, 006, 018, 044, 046, 051, 052 |
| Class Status Code | 6 - Active |
| Class Status Date | Friday, January 16, 2026 |
| Primary Code | 005 |
| First Use Anywhere Date | Tuesday, March 2, 2021 |
| First Use In Commerce Date | Tuesday, March 2, 2021 |
| Party Name | XILIO DEVELOPMENT, INC. |
| Party Type | 20 - Owner at Publication |
| Legal Entity Type | 03 - Corporation |
| Address | Waltham, MA 02451 US |
| Party Name | XILIO DEVELOPMENT, INC. |
| Party Type | 10 - Original Applicant |
| Legal Entity Type | 03 - Corporation |
| Address | Waltham, MA 02451 US |
| Event Date | Event Description |
| Friday, January 16, 2026 | NEW APPLICATION ENTERED |
| Friday, January 16, 2026 | NEW APPLICATION OFFICE SUPPLIED DATA ENTERED |
| Friday, January 16, 2026 | APPLICATION FILING RECEIPT MAILED |
| Thursday, May 14, 2026 | ASSIGNED TO EXAMINER |
| Friday, May 15, 2026 | APPROVED FOR PUB - PRINCIPAL REGISTER |
| Wednesday, June 10, 2026 | NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED |
| Tuesday, June 16, 2026 | PUBLISHED FOR OPPOSITION |
| Tuesday, June 16, 2026 | OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED |