Who owns the LET'S ENCRYPT trademark?

The LET'S ENCRYPT trademark is owned by Internet Security Research Group.

What class is the LET'S ENCRYPT trademark registered in?

The LET'S ENCRYPT trademark is registered in Class 042 (Scientific, technology & SaaS services).

What is the serial number for LET'S ENCRYPT?

The USPTO serial number for LET'S ENCRYPT is 88828174.

What is the registration number for LET'S ENCRYPT?

LET'S ENCRYPT is registered under USPTO registration number 6157921.

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LET

USPTO Trademark Record

REGISTERED

LET'S ENCRYPT

SN 88828174·Reg 6157921·Filed Mar 10, 2020

Owner Internet Security Research Group

Scientific and technological services and research and design relating thereto; industrial analysis, industrial research and industrial design services; quality control and authentication services; design and development of computer hardware and software.

LET'S ENCRYPT (Serial No. 88828174), Registration No. 6157921, is a registered US trademark filed on Mar 10, 2020 by Internet Security Research Group. This trademark covers Class 042 (Scientific, technology & SaaS services).

Section 8/9 declaration window: September 23, 2030

Mark Intelligence

LET'S ENCRYPT (Reg. #6157921) is a registered US trademark that has been protecting its owner, Internet Security Research Group, since 2020. The mark covers Class 042 (Scientific, technology & SaaS services). Goods and services include Scientific and technological services and research and design relating thereto; industrial analysis, industrial research.... The mark faced 1 opposition proceeding during prosecution.

FILED

Mar 10, 2020

SERIAL

88828174

REG#

6157921

REGISTERED

Sep 22, 2020

Filing Information

StatusREGISTERED

Filing DateMar 10, 2020

Serial Number88828174

Registration No.6157921

Registration DateSep 22, 2020

Status DateSep 22, 2020

Published for OppositionJul 07, 2020

Filing Basis & Declarations

Standard Characters ClaimedFiled as Use ApplicationUse Application Currently

International Filings

Madrid Protocol1 filings

This mark has 1 Madrid Protocol filing on record with the USPTO.

1543063

498Jun 19, 2020

Source: USPTO Madrid International Filing Requests

Full Goods & Services

CLASSES

OFFICE

USPTO

COUNTRY

Class 042Scientific, technology & SaaS services

US codes: 100, 101

First use anywhere: Feb 24, 2020

First use in commerce: Feb 24, 2020

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

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Status History

34 events

TEAS RESPONSE TO OFFICE ACTION-POST REG RECEIVED

Mar 12, 2026

TEAS RESPONSE TO OFFICE ACTION-POST REG RECEIVED

TEAS PETITION TO DIRECTOR RECEIVED

Mar 12, 2026

TEAS PETITION TO DIRECTOR RECEIVED

CASE ASSIGNED TO POST REGISTRATION PARALEGAL

Jan 29, 2026

CASE ASSIGNED TO POST REGISTRATION PARALEGAL

POST REGISTRATION ACTION MAILED - SEC. 8 & 15

Jan 29, 2026

POST REGISTRATION ACTION MAILED - SEC. 8 & 15

TEAS SECTION 8 & 15 RECEIVED

Oct 27, 2025

TEAS SECTION 8 & 15 RECEIVED

COURTESY REMINDER - SEC. 8 (6-YR) E-MAILED

Sep 22, 2025

COURTESY REMINDER - SEC. 8 (6-YR) E-MAILED

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

Aug 22, 2025

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

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Aug 22, 2025

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Aug 22, 2025

TEAS CHANGE OF CORRESPONDENCE RECEIVED

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

Aug 22, 2025

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

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Aug 22, 2025

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Aug 22, 2025

TEAS CHANGE OF CORRESPONDENCE RECEIVED

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

Dec 15, 2022

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

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Dec 15, 2022

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Dec 15, 2022

TEAS CHANGE OF CORRESPONDENCE RECEIVED

TEAS CHANGE OF OWNER ADDRESS RECEIVED

Mar 08, 2022

TEAS CHANGE OF OWNER ADDRESS RECEIVED

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

Mar 08, 2022

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

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Mar 08, 2022

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Mar 08, 2022

TEAS CHANGE OF CORRESPONDENCE RECEIVED

APPLICANT/CORRESPONDENCE CHANGES (NON-RESPONSIVE) ENTERED

Mar 08, 2022

APPLICANT/CORRESPONDENCE CHANGES (NON-RESPONSIVE) ENTERED

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

Jun 25, 2021

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

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Jun 25, 2021

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Jun 25, 2021

TEAS CHANGE OF CORRESPONDENCE RECEIVED

REGISTERED-PRINCIPAL REGISTER

Sep 22, 2020

REGISTERED-PRINCIPAL REGISTER

PUBLISHED FOR OPPOSITION

Jul 07, 2020

PUBLISHED FOR OPPOSITION

OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED

Jul 07, 2020

OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED

NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED

Jun 17, 2020

NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED

EXAMINERS AMENDMENT -WRITTEN

Jun 03, 2020

EXAMINERS AMENDMENT -WRITTEN

EXAMINERS AMENDMENT E-MAILED

Jun 03, 2020

EXAMINERS AMENDMENT E-MAILED

NOTIFICATION OF EXAMINERS AMENDMENT E-MAILED

Jun 03, 2020

NOTIFICATION OF EXAMINERS AMENDMENT E-MAILED

EXAMINER'S AMENDMENT ENTERED

Jun 03, 2020

EXAMINER'S AMENDMENT ENTERED

APPROVED FOR PUB - PRINCIPAL REGISTER

Jun 03, 2020

APPROVED FOR PUB - PRINCIPAL REGISTER

ASSIGNED TO EXAMINER

Jun 01, 2020

ASSIGNED TO EXAMINER

NEW APPLICATION OFFICE SUPPLIED DATA ENTERED

Mar 16, 2020

NEW APPLICATION OFFICE SUPPLIED DATA ENTERED

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