Patent ID: 8176973

Claim:
A finned heat pipe comprising concentric pipes of different length, comprising a base, being a plate of conductive metal and having a top surface; and two concentric circular grooves formed in the top surface and comprising an inner groove; and an outer groove; a core pipe, being cylindrical and a conductive metal, being copper-silver alloy brazed securely in the inner groove of the base with a gas-tight fit, protruding up from the base and comprising an inner surface; an outer surface; an open top; multiple holes formed around the core pipe away from the base; and a wick formed on the inner surface and outer surface between but not in contact with the base and the open top; an outer pipe, being cylindrical and a conductive metal, being copper-silver alloy brazed securely in the outer groove of the base with a gas-tight fit, protruding up from the base concentric with the core pipe and comprising an inner surface; an outer surface; an open top, being just above the multiple holes and being lower than the open top of the core pipe; and a wick being formed on the inner surface between but not in contact with the base and the open top; and a top cover, being copper-silver alloy brazed securely on and closing the open tops of the core pipe and the outer pipe; and a working fluid, being pure water and being injected into the core pipe and the outer pipe in the presence of a vacuum.