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In Re Emil Umbricht

404 F.2d 386, 404 F.2d 368, 56 C.C.P.A. 772, 160 U.S.P.Q. (BNA) 15, 1968 CCPA LEXIS 220
Court of Customs and Patent Appeals·Decided December 12, 1968·No. 8026·Published·Cited by 2 cases

Opinion

Aumonb, Judge,

delivered the opinion of the court:

This is an appeal from the decision of the Patent Office Board of Appeals 'affirming the rejection of claims 13 to 16 of appellant’s application entitled “Pump.” 1

The invention relates to an improvement in a rotary impeller centrifugal pump and particularly to a pump capable of handling liquids containing substantial amounts of suspended solids. It is stated that in the past pumps have required frequent replacement due to suspended solids getting into close clearances on rotating or sliding parts, thus causing rapid wear and consequent loss of efficiency.

The present invention alledgedly overcomes this problem by opening such clearances to an extent where the suspended solids can pass through without “grinding” between the relatively moving surfaces. High efficiency is maintained, despite the open clearances, by using an enclosed impeller, particularly in combination with backward sloping vanes forming substantially constant cross-sectional impeller passages.

The pump impeller and impeller housing are shown in Fig. 8 of appellant's application.

Impeller rotor 10 is comprised of top and bottom plates 12 and 14 and a series of equally-spaced spiral blades 16. An intake throat continuous into the interior of the rotor 10 is shown at 18. The bore of central drive collar 20, carried by top plate 12, is fitted to the end of drive shaft 22. The latter extends upward and is journaled at spaced bearings to a stationary support structure, to which the pump housing is rigidly connected by tubular pedestal column 46. The impeller housing outer wall 28 is spiral for most of its periphery with gradually increasing radius and at one side becomes tangential extending along a tangent to a discharge outlet.

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In Re Emil Umbricht, 404 F.2d 386, 404 F.2d 368, 56 C.C.P.A. 772, 160 U.S.P.Q. (BNA) 15, 1968 CCPA LEXIS 220 (ccpa 1968).

404 F.2d 386 (In Re Emil Umbricht) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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