U.S. federal trademark · Serial No. 74524761
cleaning chalk; chalk and preparations of chalk, all for water purification and preparations of chalk, all for water purification and filtration
raw chalk
chemical preparations for water purification and filtration; preparations of lime and/or chalk, all for water purification and filtration
Source: USPTO federal trademark records. Informational only, not legal advice. Status and details may lag the live USPTO database.