Today in 1998, US Patent 5788111 A was issued, an invention of Alan Grenville and Clive Waugh, for their “Drinking Vessel.” Here’s the Abstract:
An inside surface of a drinking vessel is treated with a material suitable for providing nucleation sites to encourage the formation of bubbles in a liquid containing a gas such as carbon dioxide or CO2 / nitrogen mixture. The material may be printed upon the internal surface.
