Consolidated Bunging Apparatus Co. v. Woerle

The bill in this case charges infringement of patent No. 222,975, granted December 23, 1879, to Otto Zwietusch and Edward Heitman, (Zweitusch being assignee of Heitman,) for an “improvement in automatic pressure relief apparatus for beer vessels.” The object and scope of the invention, as set out in the specifications, is said to be “to provide an automatic pressure relief valve, adapted to be used on fermenting casks containing beer and like material, which will not foul, and whereby the automatic action of the valve is made more certain; and our invention consists—First, in a pressure…