| HYDRADERMA 2142904 | Prollenium Medical Technologies, Inc. | 10 Medical | Pending | 2021 |
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| HYDRATOME 1282787 · TMA678135 | Boston Scientific Limited | 10 Medical | Registered | 2006 |
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| HYDRADE 1201082 · TMA656072 | SOCIETE DES PRODUITS NESTLE S.A. | 5 Pharmaceuticals | Registered | 2006 |
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| HYDRODUCT 1171589 · TMA663154 | ConMed Corporation | 10 Medical | Registered | 2006 |
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| HYDRATUBE 0332412 · TMA177168 | PULSAFEEDER, INC. (A DELAWARE CORPORATION) | 7 Machines | Registered | 1971 |
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| HydraDerm 2234878 | HydroDerm Manufacturing Inc. | 3 Cosmetics | Pending | 2023 |
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| Hydradermal 1667786 · TMA901865 | COSMÉTIQUES FRANCE-LAURE (1970) INC. | 3 Cosmetics | Registered | 2015 |
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| HydroDerm 2195697 · TMA1256396 | HydroDerm Manufacturing Inc. | 10 Medical | Registered | 2024 |
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| HydroToM 2026384 · TMA1275232 | CENTRE INTERDISCIPLINAIRE DE DÉVELOPPEMENT EN CARTOGRAPHIE DES OCÉANS (CIDCO) | 9 Electronics | Registered | 2024 |
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| HYDRATI 1964504 · TMA1149842 | Delta Faucet Company | 11 Lighting | Registered | 2022 |
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| HYDRATREK 1856582 · TMA1019921 · design | HYDRATREK IP, LLC | 12 Vehicles | Registered | 2019 |
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| HYDRAHYDE 1678204 · TMA985196 | Wells Lamont LLC | 21 Housewares25 Clothing | Registered | 2017 |
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| HYDROTURF 1651070 · TMA950972 | Watershed Geosynthetics LLC, Corporation organized pursuant to the laws of the State of Georgia, U.S.A | 27 Carpets | Registered | 2016 |
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| HYDROTURF 1651047 · TMA950964 · design | Watershed Geosynthetics LLC, Corporation organized pursuant to the laws of the State of Georgia, U.S.A | 27 Carpets | Registered | 2016 |
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| HYDRAIDE 1326362 · TMA786065 | Alberto-Culver USA, Inc. | 3 Cosmetics | Registered | 2010 |
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| HYDRATEC 1277184 · TMA678629 | Hydratec Hydraulics Ltd. | 7 Machines35 Advertising | Registered | 2006 |
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| HYDROTUBE 1138586 · TMA600302 | Éconoplastik inc. | 3 Cosmetics5 Pharmaceuticals10 Medical+5 | Registered | 2004 |
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| HYDROTAP 1081420 · TMA584819 | ZIP HEATERS (AUSTRALIA) PTY LIMITED | 11 Lighting12 Vehicles | Registered | 2003 |
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| HYDRODRAW 1038777 · TMA572459 | Houghton Technical Corp. | 4 Oils | Registered | 2002 |
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| HYDRAID 0330935 · TMA174733 | CALGON CORPORATION | 1 Chemicals | Registered | 1971 |
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| HYDRATIS 2365101 | Owner not listed | 5 Pharmaceuticals21 Housewares32 Beer | Pending | 2024 |
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| HYDRATINT 2340623 | NAKED AND THRIVING INC. | 3 Cosmetics | Pending | 2024 |
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| HYDRATYTE 2263109 | an individual | 44 Medical | Pending | 2023 |
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| HYDRODRY 2239021 | Owner not listed | 19 Building | Pending | 2023 |
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| HYDRATEX 2177173 | ANPIN MANUFACTURING INC. | 9 Electronics11 Lighting25 Clothing+1 | Pending | 2022 |
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