Who owns the DUOL trademark?

The DUOL trademark is owned by GRASSELI CHEMICAL COMPANY, THE.

What class is the DUOL trademark registered in?

The DUOL trademark is registered in Class 011 (Lighting, heating, cooling & sanitary apparatus).

What is the serial number for DUOL?

The USPTO serial number for DUOL is 71305075.

What is the registration number for DUOL?

DUOL is registered under USPTO registration number 279257.

Sealvo

Home Search: DUOLDUOL #71305075

Back

Updated Sep 20, 2026·33 searches this week

View on USPTO TSDR Find similar marks

DUO

USPTO Trademark Record

ABANDONED

DUOL

SN 71305075·Reg 279257·Filed Aug 27, 1930

Owner GRASSELI CHEMICAL COMPANY, THE

Apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply and sanitary purposes.

DUOL (Serial No. 71305075), Registration No. 279257, is a abandoned US trademark filed on Aug 27, 1930 by GRASSELI CHEMICAL COMPANY, THE. This trademark covers Class 011 (Lighting, heating, cooling & sanitary apparatus).

Conflict Analysis

Full conflict analysis for DUOL (SN 71305075) against the USPTO database with detailed risk factor explanations. AI-powered — takes ~1-2 min.

Mark Intelligence

DUOL (Reg. #279257) is an abandoned US trademark that was filed in 1930 but has since been abandoned. The mark covers Class 011 (Lighting, heating, cooling & sanitary apparatus). Goods and services include Apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply....

FILED

Aug 27, 1930

SERIAL

71305075

REG#

279257

REGISTERED

Jan 13, 1931

Filing Information

StatusABANDONED

Filing DateAug 27, 1930

Serial Number71305075

Registration No.279257

Registration DateJan 13, 1931

Status DateNov 03, 1992

Mark TypeStylized characters

Filing Basis & Declarations

Filed as Use ApplicationUse Application CurrentlySection 8 AcceptedSection 15 AcknowledgedTrademark

Full Goods & Services

CLASSES

OFFICE

USPTO

COUNTRY

Class 011Lighting, heating, cooling & sanitary apparatus

US codes: 011

First use anywhere: Feb 16, 1928

First use in commerce: Feb 16, 1928

Apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply and sanitary purposes.

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

Run a conflict check

Search by serial number, mark name, or logo. See conflicting marks ranked by risk with clear explanations of what contributed.

Run conflict check

Status History

2 events

EXPIRED SEC. 9

Nov 03, 1992

EXPIRED SEC. 9

REGISTERED AND RENEWED (SECOND RENEWAL - 20 YRS)

Jan 13, 1971

REGISTERED AND RENEWED (SECOND RENEWAL - 20 YRS)

Other Marks in Class 011 — Lighting, heating, cooling & sanitary apparatus

Recently filed and registered marks in the same international class.

DUO

DUOL

79368622

DUOL d.o.o.

REGISTERED

DUOL

Run a conflict check

Other Marks in Class 011 — Lighting, heating, cooling & sanitary apparatus

Get pre-filing clearance

Search 15M+ trademarks

Resources

Company