474 F.2d 671 (Fed. Cir. 1973), 8816, In re Application of De Seversky

Docket Nº:Patent Appeal 8816.
Citation:474 F.2d 671, 177 U.S.P.Q. 144
Party Name:Application of Alexander P. de SEVERSKY.
Case Date:March 08, 1973
Court:United States Court of Customs and Patent Appeals

Page 671

474 F.2d 671 (Fed. Cir. 1973)

177 U.S.P.Q. 144

Application of Alexander P. de SEVERSKY.

Patent Appeal No. 8816.

United States Court of Customs and Patent Appeals.

March 8, 1973

Rehearing Denied April 19, 1973.

Page 672

S. Wm. Cochran, Washington, D. C., for the Commissioner of Patents. R. V. Lupo, William H. Beha, Jr., Washington, D. C., of counsel.

Before MARKEY, Chief Judge, and RICH, ALMOND, BALDWIN, and LANE, Judges.

RICH, Judge.

This appeal is from the decision of the Patent Office Board of Appeals, adhered to on reconsideration, affirming the rejection of claims 1 and 10 of appellant's application serial No. 723, 810, filed April 24, 1968, entitled "Multi-Concentric Wet Electrostatic Precipitator, " for obviousness under 35 U.S.C. § 103. We affirm.

Generally, the wet precipitator includes two concentric cylinders which define an annular space between them. Contaminated air or gas to be cleaned is directed through this annular space. Water is caused to flow on the inside surface of the outer cylinder as well as on the outside surface of the inner cylinder. A discharge electrode structure is disposed within the annular space to establish an electrostatic field between the liquid films which line the annular passage. Contaminated gas is introduced through the bottom end of the passage between the cylinders through annular Venturi slots and is subjected to the electrostatic field which causes the particles in the gaseous stream to become ionized and migrate to the collecting films on the surfaces of the tubes lining the passages. The liquid films then carry the extracted matter away into a drain.

The significant aspect of this invention is the Venturi inlet which causes the gas flow to spread outwardly against the water films and press them against the walls of the annular passage. Claim 1 reads (emphasis ours):

1. An electrostatic wet precipitator comprising: (a) concentrically arranged collector tubes defining at least one vertically-disposed annular gas passage,

(b) means to produce downwardly-flowing films of liquid on the complementary surfaces of adjacent tubes which line said passage thereby to form liquid collectors,

(c) a discharge-electrode structure disposed within said passage in spaced relation to said liquid collectors;

(d) inlet means including a Venturi opening to feed a contaminated gaseous stream into the lower end of each passage to produce an expanding gas which flows upwardly through said

Page 673

passage in counter-current relationship to said liquid films to force said films against said surfaces to maintain the uniformity...

To continue reading