US005417921A
United States Patent [19] [11] Patent Number: 5,417,921
Dove et al. [45] Date of Patent: May 23,1995
[54] METHOD FOR REMOVING FUMIGATION GASES FROM FUMIGATED STRUCTURES
[75] Inventors: Robert L. Dove, Mt. Crawford;
Donald G. Shaheen, Harrisonburg, both of Va.
[73] Assignee: Degesch America, Inc., Weyers Cave, Va.
[21] Appl. No.: 25,431
[22] Filed: Mar. 3,1993
[51] Int.Cl.« A61L9/00
[52] U.S. CI 422/30; 422/31;
422/32; 422/122; 422/181; 422/218; 95/116;
96/132; 96/136
[58] Field of Search 422/32, 30, 31, 120,
422/122, 234, 305, 181, 218; 423/210; 426/312, 320, 418, 419; 43/125; 95/116; 96/131, 132,
133, 135, 136
[56] References Cited
U.S. PATENT DOCUMENTS
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FOREIGN PATENT DOCUMENTS
1588883 8/1990 U.S.S.R 422/181
Primary Examiner—Robert J. Warden
Assistant Examiner—Krisanne M. Thornton
Attorney, Agent, or Firm—Arnold, White & Durkee
[57] ABSTRACT
A method for removing fumigation gasses from fumigated structures is provided. Air is directed from a structure through an adsorption unit and then recirculated back into the structure. A fan directs air through the adsorption unit. The adsorption unit contains an annularly shaped adsorption bed and an inner passage way and outer passage way through which fumigation gasses are directed. A lower adsorption efficiency per pass through the adsorption bed is used in conjunction with multiple passes with the method of the present invention.
18 Claims, 5 Drawing Sheets
