The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 1992
Filed:
May. 07, 1990
Howard W Selby, III, Boulder, CO (US);
Selsys Corporation, Boulder, CO (US);
Abstract
An improved process and apparatus for the extraction of espresso coffee from ground coffee beans in which the pressure of extraction is precisely regulated by a pressure valve and is not dependent on coffee grind size, degree of compaction of the coffee grind, or operator skill. A feature of the invention is in an assembly of the brewing chamber and regulator valve for convenient removal and attachment to an espresso machine as a unit without otherwise modifying the machine. The assembly is configurable with the regulator valve within a common housing which also defines the brewing chamber, or with a regulator valve separate from the brewing chamber assembly but attached to an outlet of the brewing chamber.