Who owns the KNOW ESR1 trademark?

The KNOW ESR1 trademark is owned by Stemline Therapeutics, Inc..

What is the serial number for KNOW ESR1?

The USPTO serial number for KNOW ESR1 is 99022842.

What is the registration number for KNOW ESR1?

KNOW ESR1 is registered under USPTO registration number 7991872.

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Home Search: KNOW ESR1KNOW ESR1 #99022842

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Updated Sep 19, 2026·14 searches this week

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KNO

USPTO Trademark Record

REGISTERED

KNOW ESR1

Q: What class is the KNOW ESR1 trademark registered in?

The KNOW ESR1 trademark is registered in Class 041 (Education & entertainment services), Class 044 (Medical, veterinary & beauty care services).

SN 99022842·Reg 7991872·Filed Jan 29, 2025

Owner Stemline Therapeutics, Inc.

Education; providing of training; entertainment; sporting and cultural activities.; Medical services; veterinary services; hygienic and beauty care for human beings or animals; agriculture, aquaculture, horticulture and forestry services.

KNOW ESR1 (Serial No. 99022842), Registration No. 7991872, is a registered US trademark filed on Jan 29, 2025 by Stemline Therapeutics, Inc.. This trademark covers Class 041 (Education & entertainment services), Class 044 (Medical, veterinary & beauty care services).

early section 8: October 21, 2031

Conflict Analysis

Full conflict analysis for KNOW ESR1 (SN 99022842) against the USPTO database with detailed risk factor explanations. AI-powered — takes ~1-2 min.

Mark Intelligence

KNOW ESR1 (Reg. #7991872) is a registered US trademark that has been protecting its owner, Stemline Therapeutics, Inc., since 2025. The mark covers Class 041 (Education & entertainment services) and Class 044 (Medical, veterinary & beauty care services) respectively. Goods and services include Education; providing of training; entertainment; sporting and cultural activities.; Medical services; veterinary service.... The mark faced 1 opposition proceeding during prosecution.

FILED

Jan 29, 2025

SERIAL

99022842

REG#

7991872

REGISTERED

Oct 21, 2025

Filing Information

StatusREGISTERED

Filing DateJan 29, 2025

Serial Number99022842

Registration No.7991872

Registration DateOct 21, 2025

Status DateOct 21, 2025

Published for OppositionSep 02, 2025

Filing Basis & Declarations

Filed as Use ApplicationUse Application Currently

Full Goods & Services

CLASSES

OFFICE

USPTO

COUNTRY

Class 041Education & entertainment services

US codes: 100, 101, 107

First use anywhere: Jul 26, 2024

First use in commerce: Jul 26, 2024

Education; providing of training; entertainment; sporting and cultural activities.

Class 044Medical, veterinary & beauty care services

US codes: 100, 101

First use anywhere: Jul 26, 2024

First use in commerce: Jul 26, 2024

Medical services; veterinary services; hygienic and beauty care for human beings or animals; agriculture, aquaculture, horticulture and forestry services.

This description is as filed with the USPTO and defines the scope of trademark protection.

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Status History

16 events

TEAS REVOKE/APP/CHANGE ADDR OF ATTY/DOM REP RECEIVED

Jul 31, 2026

TEAS REVOKE/APP/CHANGE ADDR OF ATTY/DOM REP RECEIVED

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Jul 31, 2026

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Jul 31, 2026

TEAS CHANGE OF CORRESPONDENCE RECEIVED

REGISTERED-PRINCIPAL REGISTER

Oct 21, 2025

REGISTERED-PRINCIPAL REGISTER

NOTICE OF REGISTRATION CONFIRMATION EMAILED

Oct 21, 2025

NOTICE OF REGISTRATION CONFIRMATION EMAILED

PUBLISHED FOR OPPOSITION

Sep 02, 2025

PUBLISHED FOR OPPOSITION

OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED

Sep 02, 2025

OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED

NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED

Aug 27, 2025

NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED

APPROVED FOR PUB - PRINCIPAL REGISTER

Aug 01, 2025

APPROVED FOR PUB - PRINCIPAL REGISTER

TEAS VOLUNTARY AMENDMENT RECEIVED

Jul 28, 2025

TEAS VOLUNTARY AMENDMENT RECEIVED

PRELIMINARY/VOLUNTARY AMENDMENT - ENTERED

Jul 28, 2025

PRELIMINARY/VOLUNTARY AMENDMENT - ENTERED

ASSIGNED TO EXAMINER

Jul 09, 2025

ASSIGNED TO EXAMINER

NEW APPLICATION OFFICE SUPPLIED DATA ENTERED

Jul 01, 2025

NEW APPLICATION OFFICE SUPPLIED DATA ENTERED

NOTICE OF DESIGN SEARCH CODE E-MAILED

Jul 01, 2025

NOTICE OF DESIGN SEARCH CODE E-MAILED

NEW APPLICATION ENTERED

Jan 29, 2025

NEW APPLICATION ENTERED

APPLICATION FILING RECEIPT MAILED

Jan 29, 2025

APPLICATION FILING RECEIPT MAILED

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