Today in 1912, US Patent 1031950 A was issued, an invention of Walter J. Miller, for his “Sanitary Vacuum Beer-Mug.” There’s no Abstract, although in the description it includes this summary:

The main object of the invention is to provide a device especially adapted for use as a beer mug, in which the beer will be retained in fresh and sparkling condition for considerable time.’

Another object of the invention is to provide a device of this character which, to a real extent, safeguards the liquid contained therein from contamination.

Another object of the invention is to provide a sanitary beer mug or drinking vessel which can be readily washed or cleaned both inside and out.