Who owns the DUOLOC trademark?

The DUOLOC trademark is owned by Classen Holz Kontor GmbH.

What is the serial number for DUOLOC?

The USPTO serial number for DUOLOC is 79418336.

What is the registration number for DUOLOC?

DUOLOC is registered under USPTO registration number 8131739.

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Updated Oct 6, 2026·40 searches this week

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DUO

USPTO Trademark Record

REGISTERED

DUOLOC

Q: What class is the DUOLOC trademark registered in?

The DUOLOC trademark is registered in Class 006 (Common metals, their alloys & metal goods), Class 019 (Non-metallic building materials).

SN 79418336·Reg 8131739·Filed Jan 22, 2025

Owner Classen Holz Kontor GmbH

Common metals and their alloys, ores; metal materials for building and construction; transportable buildings of metal; non-electric cables and wires of common metal; small items of metal hardware; metal containers for storage or transport; safes.; Materials, not of metal, for building and construction; rigid pipes, not of metal, for building; asphalt, pitch, tar and bitumen; transportable buildings, not of metal; monuments, not of metal.

DUOLOC (Serial No. 79418336), Registration No. 8131739, is a registered US trademark filed on Jan 22, 2025 by Classen Holz Kontor GmbH. This trademark covers Class 006 (Common metals, their alloys & metal goods), Class 019 (Non-metallic building materials).

early section 8: February 10, 2032

Mark Intelligence

DUOLOC (Reg. #8131739) is a registered US trademark that has been protecting its owner, Classen Holz Kontor GmbH, since 2025. The mark covers Class 006 (Common metals, their alloys & metal goods) and Class 019 (Non-metallic building materials) respectively. Goods and services include Common metals and their alloys, ores; metal materials for building and construction; transportable buildings of metal; n.... The mark faced 6 opposition proceedings during prosecution.

FILED

Jan 22, 2025

SERIAL

79418336

REG#

8131739

REGISTERED

Feb 10, 2026

Filing Information

StatusREGISTERED

Filing DateJan 22, 2025

Serial Number79418336

Registration No.8131739

Registration DateFeb 10, 2026

Status DateFeb 10, 2026

Published for OppositionDec 23, 2025

Filing Basis & Declarations

Standard Characters ClaimedTrademark

Full Goods & Services

CLASSES

OFFICE

USPTO

COUNTRY

Class 006Common metals, their alloys & metal goods

US codes: 002, 012, 013, 014, 023, 025, 050

Class 019Non-metallic building materials

US codes: 001, 012, 033, 050

Materials, not of metal, for building and construction; rigid pipes, not of metal, for building; asphalt, pitch, tar and bitumen; transportable buildings, not of metal; monuments, not of metal.

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

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Status History

27 events

NOTIFICATION OF POSSIBLE OPPOSITION - PROCESSED BY IB

Aug 20, 2026

NOTIFICATION OF POSSIBLE OPPOSITION - PROCESSED BY IB

FINAL DISPOSITION NOTICE SENT TO IB

Aug 14, 2026

FINAL DISPOSITION NOTICE SENT TO IB

FINAL DISPOSITION PROCESSED

Aug 13, 2026

FINAL DISPOSITION PROCESSED

NOTIFICATION OF POSSIBLE OPPOSITION CREATED, TO BE SENT TO IB

Aug 05, 2026

NOTIFICATION OF POSSIBLE OPPOSITION CREATED, TO BE SENT TO IB

NOTIFICATION OF POSSIBLE OPPOSITION SENT TO IB

Aug 05, 2026

NOTIFICATION OF POSSIBLE OPPOSITION SENT TO IB

FINAL DISPOSITION NOTICE CREATED, TO BE SENT TO IB

May 10, 2026

FINAL DISPOSITION NOTICE CREATED, TO BE SENT TO IB

REGISTERED-PRINCIPAL REGISTER

Feb 10, 2026

REGISTERED-PRINCIPAL REGISTER

NOTICE OF REGISTRATION CONFIRMATION EMAILED

Feb 10, 2026

NOTICE OF REGISTRATION CONFIRMATION EMAILED

PUBLISHED FOR OPPOSITION

Dec 23, 2025

PUBLISHED FOR OPPOSITION

OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED

Dec 23, 2025

OFFICIAL GAZETTE PUBLICATION CONFIRMATION E-MAILED

NOTIFICATION PROCESSED BY IB

Dec 18, 2025

NOTIFICATION PROCESSED BY IB

NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED

Dec 17, 2025

NOTIFICATION OF NOTICE OF PUBLICATION E-MAILED

NOTIFICATION OF POSSIBLE OPPOSITION SENT TO IB

Dec 03, 2025

NOTIFICATION OF POSSIBLE OPPOSITION SENT TO IB

NOTICE OF START OF OPPOSITION PERIOD CREATED, TO BE SENT TO IB

Dec 02, 2025

NOTICE OF START OF OPPOSITION PERIOD CREATED, TO BE SENT TO IB

APPROVED FOR PUB - PRINCIPAL REGISTER

Nov 22, 2025

APPROVED FOR PUB - PRINCIPAL REGISTER

TEAS RESPONSE TO OFFICE ACTION RECEIVED

Nov 14, 2025

TEAS RESPONSE TO OFFICE ACTION RECEIVED

CORRESPONDENCE RECEIVED IN LAW OFFICE

Nov 14, 2025

CORRESPONDENCE RECEIVED IN LAW OFFICE

TEAS/EMAIL CORRESPONDENCE ENTERED

Nov 14, 2025

TEAS/EMAIL CORRESPONDENCE ENTERED

REFUSAL PROCESSED BY IB

Aug 29, 2025

REFUSAL PROCESSED BY IB

REFUSAL PROCESSED BY MPU

Aug 14, 2025

REFUSAL PROCESSED BY MPU

NON-FINAL ACTION MAILED - REFUSAL SENT TO IB

Aug 14, 2025

NON-FINAL ACTION MAILED - REFUSAL SENT TO IB

NON-FINAL ACTION (IB REFUSAL) PREPARED FOR REVIEW

Jul 03, 2025

NON-FINAL ACTION (IB REFUSAL) PREPARED FOR REVIEW

NON-FINAL ACTION WRITTEN

Jul 02, 2025

NON-FINAL ACTION WRITTEN

ASSIGNED TO EXAMINER

Jul 01, 2025

ASSIGNED TO EXAMINER

NEW APPLICATION OFFICE SUPPLIED DATA ENTERED

Mar 07, 2025

NEW APPLICATION OFFICE SUPPLIED DATA ENTERED

APPLICATION FILING RECEIPT MAILED

Mar 07, 2025

APPLICATION FILING RECEIPT MAILED

SN ASSIGNED FOR SECT 66A APPL FROM IB

Mar 06, 2025

SN ASSIGNED FOR SECT 66A APPL FROM IB

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