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Application of Hans Doebl, Kurt Bohrmann and Wilhelm Ruhl

404 F.2d 375, 56 C.C.P.A. 730
CourtCourt of Customs and Patent Appeals
DecidedNovember 27, 1968
DocketPatent Appeal 8006
StatusPublished

This text of 404 F.2d 375 (Application of Hans Doebl, Kurt Bohrmann and Wilhelm Ruhl) is published on Counsel Stack Legal Research, covering Court of Customs and Patent Appeals primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Application of Hans Doebl, Kurt Bohrmann and Wilhelm Ruhl, 404 F.2d 375, 56 C.C.P.A. 730 (ccpa 1968).

Opinion

WORLEY, Chief Judge.

The Board of Appeals affirmed the examiner’s rejection of process claims 1-5 1 as unpatentable in view of certain prior art. Appellants allege reversible error.

The invention relates to a mixing process for treating plastic materials. The process and associated apparatus are described in the following terms in the specification, which should be read in conjunction with Figure 5 of the appellants’ drawings:

* * * the individual particles of the plastic material to be treated are reciprocated in a preferably horizontal tubular container or shell through which the material is passed. The reciprocating movement, i. e. to and fro, occurs within the space delimited by two swash plate type mixing elements. The reciprocating motion occurs about 50 times per second in an approximately axial direction, i. e. parallel to the axis of the tubular shell, and superimposed upon this motion is a synchronous, radial, motion whereby a varying acceleration is imparted to the individual particles of the material being mixed or otherwise treated.
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* * * the apparatus includes a cylindrical container or shell having a rotatable shaft coaxially mounted therein on which a plurality of mixing elements are mounted at an inclined angle with respect to the shaft axis, the individual elements having *376 a greater forwardly-conveying and lesser rearwardly-conveying effect.
* * * the mixing elements are particularly easy to manufacture as they may be stamped out of a flat sheet of metal, for example.
The individual mixing elements include a plurality of substantially planar blades, for example each mixing element may include three blades, two of which are forwardly-conveying and one of which is rearwardly-conveying, although any other combination of number of blades and forwardly- and rearwardly-conveying blades may be employed so long as the net effect is a forwardly-conveying element. The tips of the blades of the individual mixing elements lie on an elliptical curve and have close clearance with the inner wall of the container or shell. The planes of the individual mixing elements may be parallel to each other or, if desired, the planes of the elements may have the same inclination with respect to the shaft axis but a different inclination with respect to each other. * * *
* * * -x- * *
-x- * * a series of swash plates are arranged on the shaft 2 as mixing elements and, thus, upon rotation of the shaft, a reciprocating movement is synchronously superimposed on the rotational movement of the material to be mixed and which is subjected to the action of the swash plates. * *
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The flow of material from the feed funnel 9 to the discharge 10 is effected by contact of the materials to be mixed with the mixing elements and/or by inclination of the entire apparatus.
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The flow of the material to be treated takes place from right to left in the embodiment of Figure 5, the shaft 2 rotating in the direction shown by the arrow. Three blades, designated 5 and 7, are provided on each mixing element, two of which, i. e., blades 5, act in a forwardly-conveying direction while blade 7 acts in a rearwardly-conveying direction.
Due to the resulting back and forth movement imparted to the material, an excellent mixing effect is obtained. The reference numeral 6 designates a mixing element rotated about 90° with respect to the other elements. # ^ #
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Related

Conditions for patentability; non-obvious subject matter
35 U.S.C. § 103

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Bluebook (online)
404 F.2d 375, 56 C.C.P.A. 730, Counsel Stack Legal Research, https://law.counselstack.com/opinion/application-of-hans-doebl-kurt-bohrmann-and-wilhelm-ruhl-ccpa-1968.