After-market retailers also sell bottomless portafilters that minimize the espresso's contact with any metal. A bottomless portafilter is one tool baristas use to analyze the quality of the coffee grind and the evenness of the extraction.
Wipo Publishes Patent of Adager and Francisco Alfredo Rego for "Apparatus to Control the Dispensing of a Precise Amount of Ground Coffee into an Espresso Portafilter Basket" (American Inventor)
Feb 04, 2013; GENEVA, Feb. 4 -- Publication No. WO/2013/015801 was published on Jan. 31.Title of the invention: "APPARATUS TO CONTROL THE...