Today in 1983, US Patent 4409246 A was issued, an invention of Graham G. Stewart, Thomas E. Goring, and Ingeborg Russell, assigned to the Labatt Brewing Company, for their “Yeast Strain For Fermenting High Plato Value Worts.” Here’s the Abstract:

The specification discloses a novel brewers’ yeast strain and a method of manufacturing the same. The yeast is a strain of Saccharomyces cerevisiae and has been deposited at the National Collection of Yeast Cultures, Norwich, England under the number 962. Morphologically the giant colony of the novel strain can be described as a circular colony having a slightly serrated periphery, a convex surface topography with a central, globular dome and exhibiting primary concentric convolutions and secondary radial convolutions which, in combination, impart a rough appearance to the surface. The novel ale strain has the advantages that it is effective in worts having high plato values and is a bottom-cropping strain.