Today in 1959, US Patent 2894844 A was issued, an invention of James G. Shakman, assigned to the Pabst Brewing Co., for his “Canning Process and Product.” There’s no Abstract, although in the description it includes this summary:

[This invention is for an] improved process for canning substances which are processed during the general course of canning and which contain a gas, or contain vaporizable liquid, or are capable of expanding and so are capable of producing internal pressure in the can during such processing.

A more specific object of the invention is to provide a new and improved process for canning carbonated liquids, such as beer and other carbonated beverages, which are normally canned with a head space above the liquid level.