Today in 1949, US Patent 2472252A was issued, an invention of Arthur Henry Hughes, assigned to Messrs. Arthur Guinness Son and Company Limited, for his “Process For The Preservation Of Beer.” There’s no Abstract, though the description in the application states that he’s invented “invention relates to the preservation of beer, which term as used herein includes both ale and stout,” apparently by adding “0.041% by volume of hen egg-whites.”