daashe.blogg.se - Crosby Safety Valve Sizing Program

In the defendant's valve, complainant's Exhibit A, the same effects, in operation, are produced as in the Richardson valve, by the means described in Richardson's claims. Such a valve necessarily requires an annular steam-way.

But, before 1866, an annular form of safety-valve was well known.

The Richardson patents have a disc valve, an annular huddling chamber, an annular stricture at the outer extremity of the radii from the centre of the valve, an additional area which is radially beyond the disc valve, and a cylindrical steam-way.

When the ideas necessary to success are made known, and a structure embodying those ideas is given to the world, it is easy for the skilful mechanic to vary the form by mechanism which is equivalent, and is, therefore, in a case of this kind, an infringement. The fact that the known valves were not used, and the speedy and extensive adoption of Richardson's valve, are facts in harmony with the evidence that his valve contains just what the prior valves lack, and go to support the conclusion at which we have arrived on the question of novelty. He used some things which had been used before, but he added just that which was necessary to make the whole a practically valuable and economical apparatus. Richardson's invention brought to success what prior inventors had essayed and partly accomplished.The specification of the patent is as follows: Go to Richardson, September 25, 1866, for an improvement in steam safety-valves.

On the 27th of May, 1879, the Consolidated Safety-Valve Company, a Connecticut corporation, brought a suit in equity, in the Circuit Court of the United States for the District of Massachusetts, against the Crosby Steam Gauge and Valve Company a Massachusetts corporation, for the infringement of letters patent No.