Today in 1950, US Patent 2529882 A was issued, an invention of Carl F. Mittman, for his “Hop Strainer.” There’s no Abstract, although in the description it includes this summary:

This invention relates to strainers, clarifiers and. filters, and more particularly to a combined hop strainer and trub clarifier or separator for use in the brewing industry.

An object of this invention is to provide an improved strainer, clarifier and separator with which the cooked hops and wort may be separated continuously, completely and rapidly; with which a major amount of the trub, that is, the fine solids of the cooked hops and wort mixture, will be effectively separated from the wort; with which no sugar coating on the separating surface can take place; with which the separating surfaces will be automatically cleaned; with which all parts of the apparatus Will be easily accessible for cleaning and collection of stale wort is prevented; which will have maximum capacity with minimum overall dimensions and low cost of operation; and which will be relatively simple, compact, efficient, practical and inexpensive.

Another object of the invention is to provide an improved simple, inexpensive and continuous method of separating cooked hops and wort; with which maximum recovery of the wort is .possible; and which will require only relatively simple apparatus.

Another object is to provide an improved method and apparatus for continuously separating cooked hops from wort; with which the separation Will occur upon a clean and sterile screen; with which the screen will be conditioned continuously and automatically during use.