Abstract: The present invention relates to an etching composition and a method of producing a MXene. The etching composition of the present invention can stably and quickly produce a MXene at high temperature. The etching composition of the present invention can produce a MXene in high yield. The etching composition of the present invention can easily produce various types of MXenes. A method using the etching composition of the present invention can produce a MXene having excellent electrochemical and mechanical properties.

Abstract: The present invention is related to a water faucet having a water temperature retaining feature. The water faucet includes a hot water control, a cold water control, a mixing chamber for receiving the hot water and the cold water, a first flow control cartridge operationally coupled with the hot water control for regulating the flow of hot water, a second flow control cartridge operationally coupled with the cold water control for regulating the flow cold water, an outlet for dispensing a mixture of hot and cold water received from the mixing chamber, and a master control for controlling the dispensing of water through the outlet, wherein the master control is capable of stopping the dispensing of water through the outlet while either of the hot water control and the cold water is in an open position.

Abstract: A rotatable water faucet having a water temperature retaining feature includes a hot water control, a cold water control, a mixing chamber for receiving the hot and cold water, a water passage rotatably connected to the mixing chamber for dispensing a mixture of hot and cold water received from the mixing chamber through an outlet of the water passage, and a master control for controlling the dispensing of water through the outlet, wherein the master control is capable of stopping the dispensing of water through the outlet while at least one of the hot water control and the cold water control is in an open position, wherein rotation of the water passage is capable of stopping the dispensing of water through the outlet while the master control, and at least one of the hot water control and the cold water control are in the open position.

Abstract: The present invention is related to a water faucet having a water temperature retaining feature. The water faucet includes a hot water control, a cold water control, a mixing chamber for receiving the hot water and the cold water, a first flow control cartridge operationally coupled with the hot water control for regulating the flow of hot water, a second flow control cartridge operationally coupled with the cold water control for regulating the flow cold water, an outlet for dispensing a mixture of hot and cold water received from the mixing chamber, and a master control for controlling the dispensing of water through the outlet, wherein the master control is capable of stopping the dispensing of water through the outlet while either of the hot water control and the cold water is in an open position.

Abstract: A staple remover has first and second levers having a distal end and a proximal end, in which the distal ends of the first and second levers are pivotally connected for rotation about an axis. The second lever has parallel walls and a pair of teeth upwardly projecting from top of the proximal end wall. Each tooth comprises a front wall and gradually down-sloped back portion. The back portion of each tooth is gradually sloped downward to push the disengaged staples toward the distal end of the first lever. The staple remover also includes a spring strip mounted on an inner surface of the first lever and biased with a wire connected to the second lever. The spring strip is made with a flexible metal. One end of the wire is connected to the spring strip and the other end of the wire is connected to the second lever around a pin so that when the first and the second levers are in a closed position with respect to each other, the spring strip is biased toward the wedging elements of the first lever.