U.S. federal trademark · Serial No. 85952730
services which permit multi-stage fracturing of the wellbore including setting in a wellbore a liner string including a series of zone-isolation packers and sliding sleeves, introducing successive, sized blocking elements (drop balls) into the liner string to block the flow of fluid and open successive sliding sleeves in order to direct the fluid into the formation, especially when pressurized fracturing fluid is introduced into the wellbore
Source: USPTO federal trademark records. Informational only, not legal advice. Status and details may lag the live USPTO database.