Today in 1894, US Patent 521650 A was issued, an invention of Carl Hafner, for his “Beer Filter.” There’s no Abstract, though it’s described this way in the application:

This invention relates to certain improvements vin filters, particularly beer filters. The object of the invention is to provide an improved beer filter exceedingly cheap, simple and durable in construction, and which will thoroughly and economically filter the ,beer 1n an improved manner.

The invention consists in certain novel features of construction and in combination of the parts more fully pointed out hereinafter and particularly described in the claim.