| OLEIS 1899154 · TMA1085740 | Owner not shown | 11 Lighting | Registered | 2020 |
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| OLIGO 1534879 · TMA880396 · design | Nitto Denko Avecia Inc. | 40 Treatment42 Science | Registered | 2014 |
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| OLIGO 1498816 · TMA844164 | MELALEUCA, INC. | 5 Pharmaceuticals | Registered | 2013 |
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| OLCO 0590591 · TMA354236 · design | OLCO PETROLEUM GROUP INC. | 1 Chemicals4 Oils9 Electronics+2 | Registered | 1989 |
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| OLCO 0590590 · TMA351477 · design | OLCO PETROLEUM GROUP INC. | 1 Chemicals4 Oils9 Electronics+2 | Registered | 1989 |
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| OLCO 0590589 · TMA350285 | OLCO PETROLEUM GROUP INC. | 1 Chemicals4 Oils9 Electronics+2 | Registered | 1989 |
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| OLIGO 0499678 · TMA284885 | AGRO-100 LTÉE | 1 Chemicals | Registered | 1983 |
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| OULEIKE 2332655 · design | Shenzhen Ouleike Glasses Co. Ltd. | 9 Electronics | Pending | 2024 |
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| OliX 2170167 · TMA1262724 | OliX Pharmaceuticals, Inc. | 5 Pharmaceuticals42 Science | Registered | 2024 |
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| OLIQ 1918275 · TMA1109065 | MIGROS-GENOSSENSCHAFTS-BUND | 5 Pharmaceuticals | Registered | 2021 |
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| OLC 1705602 · TMA950069 | Calgon Carbon Corporation, a Delaware corporation | 1 Chemicals | Registered | 2016 |
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| OLEX 1628939 · TMA905736 · design | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
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| OLEX 1628938 · TMA902230 · design | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
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| OLEXA 1619051 · TMA904434 | Owner not shown | 1 Chemicals | Registered | 2015 |
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| OLEX 1579728 · TMA902231 | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
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| OLIS 1296872 · TMA688449 | CACEIS Bank (Société anonyme) | 9 Electronics35 Advertising36 Finance | Registered | 2007 |
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| OLGC 0912990 | Ontario Lottery and Gaming Corporation | All goods and services | Protected | 2001 |
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| OLEX 0489851 · TMA278580 | TForce Holdings Inc. | 39 Transport | Registered | 1983 |
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| OLEX 0348850 · TMA195457 | UOP LLC (A DELAWARE CORPORATION) | 42 Science | Registered | 1973 |
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| OLIZ 2324212 · design | Shenzhen Kenong Gardening Technology Co.Ltd. | 11 Lighting21 Housewares | Pending | 2024 |
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| OLEGA 2296089 · design | Lianjiang Zhiyu Electric Co. Ltd. | 11 Lighting | Pending | 2023 |
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| OLLIES 2273573 · design | JT MARC LLC | 21 Housewares | Pending | 2023 |
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| OLUJO 2273515 · design | Owner not listed | 33 Wine | Pending | 2023 |
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| OLUJO 2273514 · design | Owner not listed | 33 Wine | Pending | 2023 |
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| OLUJO 2273513 · design | Owner not listed | 33 Wine | Pending | 2023 |
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