Court Opinion

ID: 8797112
Source: CourtListenerOpinion
Date Created: 2022-11-26 14:15:02.490544+00
Date Added: 2024-06-11T17:03:41.483055
License: Public Domain

LACOMBE, Circuit Judge.
We are entirely satisfied to sustain the decree on the opinion of Judge Plough, which very clearly and accurately describes McLean’s contribution to the art, with its automatic synchronous control and regulation of both ends of the draft which enters below the fire box' and leaves through the chimney-stack.
Some reference, however, should be made to- the Peck British patent 11,033 of 1893, which is not discussed in the opinion of the District Judge for the obvious reason that defendant’s experts evidently considered it of no particular importance, dismissing it with the statement, in a half-dozen lines, that it “makes a suggestion as to the initial pressure in the combustion chamber.” In this court, however, it is the item of prior art mainly relied on in the argument as showing anticipation. We fixid this argument wholly unpersuasive. Peck mounts the blower fan and the exhaust fan on the same shaft so that they move synchronously; but since he shows them both of the same size, and since the evidence shows that the volumes they have to deal with do not remain constant, manifestly they will not accomplish the desired result. Appellant’s counsel contends that the ordinary skilled workman in this art would know that fans should be differently proportioned. Whether or not the skilled workman would know this the testimony does not inform us; but if he did and if he made the change of proportions, he would still come short of doing what McLean did, viz., securing a range of variations which would operate efficiently under .substantially all the varying rates of combustion which may call for control.
The Darrin & McLean patent, No. 690,931, was also strongly relied on in the argument as an anticipation. Although these patentees appreciated the problem and supposed they had solved it the testimony shows that apparatus constructed in accordance with thé specifications of that patent failed to solve the problem. The main cause of its failure was that it did not handle intermediate and changing conditions of combustion for the reason that the dampers relied on for control, as complainant’s counsel expresses it, “flopped open or flopped shut.” We do not find in the Darrin McLean patent any warrant for the modifications of structure, which appellant contends would malee the device operative, and therefore think it unnecessary to discuss *951tiie arguments pro and con as to whether tiie modifications would accomplish die result obtained with an apparatus constructed in conform] iy with the patent in suit.
The decree is affirmed, with costs.