US Patent 11247756 Life vest marker

A marker system including a sleeve including a slot, a board, at least one hole, an upper end and a lower end, the slot including an opening disposed on the upper end, the board configured to slide within the slot and through the opening, the at least one hole disposed on the lower end to allow entry of fluid into the slot to urge the board through the opening and exit of the fluid from the slot and the sleeve is configured to be secured to a life vest, wherein when the sleeve is disposed in a body of fluid with the opening faces upwardly, the board extends through the opening, serving as a marker to get attention of one or more users around the life vest and when the sleeve is disposed outside of the body of fluid.