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UnitedStatesPatent [191 Iliffetal. [54] LIQUID/SUPERCRITICALCARBON DIOXIDE/DRY CLEANING SYSTEM [75] Inventors: RobertJ.Diff,Oakley;JamesD. Mitchell, Alamo; Daniel T. Carty, Danville; James R. Latham, Livermore; Stephen B. Kong, Alameda, alof [73] Assignee: TheCloroxCompany,Oakland,Calif. [21] App1.No.: 162,563 [22] Filed: Dec.6,1993 RelatedUS. ApplicationData [63] Continuation-impartofSet.NO.912,932,In].13,1992, Pat. No. 5,267,455. ’ [51] Int.Cl.6..D06F43/02 [52] US.Cl...68/50;34/72 [581 FieldofSearch..68/5c,18R,18o, 68/18 F; 134/951; 34/26, 32, 36, 72, 74 [56] ReferencesCited U.S.PATENT DOCUMENTS 3,969,196 7/1976 Zosel. 4,012,194 3/1977 Maffei . 4,219,333 8/1980 Harris . 4,308,200 12/1981 Fremont .............................260/110 (List continued on next page.) FOREIGN PATENT DOCUMENTS 0518653Al 12/1992 EuropeanPat.Off.,. 0530949A1 3/1993 EuropeanPat.Off.. 2027003 6/1970 Germany . 3906735 6/1990 Germany . 3904513 8/1990 Germany . (List continued on next page.) OTHER PUBLICATIONS Pellerin, “Supercritical Fluid Extraction of Natural Raw MaterialsfortheFlavorandPerfumeIndustry,” Perfumer and Flavorist, vol. 16, pp. 37-39 (1991). Tateo,etal.,“ProductionofRosemaryOleoresinUsing Supercritical Carbon Dioxide,” Per?zmer and Flavonlrt, vol. 12, pp. 27-34 (1988). US005412958A [1] PatentNumber: 5,412,958 [45] DateofPatent: May9,1995 Warreneta1.,“MoodBene?tsofFragrance,”Perfumer and Flavorist, vol. 18, pp. 7—16 (1993). Buchbauer, “Aromatherapy: Do Essential Oils Have Therapeutic Properties?” Perfumer and Flavorist, vol. 15, pp. 47-50 (1990). JP62-172096, Jul. 29, 1987, “Extraction of Essential Oil . . . Using Sub or Supercritical Fluid, Pret. Carbon Dioxide ...” (Abstract Only). WO90-02836, Mar. 22, 1990, “Supercritical Deligni? cation of wood ...” (Abstract Only). Klemola et al., “Vanilla Prepn. ...Supercritical Carbon Dioxide,”US. 4,847,422(amongothers),Jul.1,1989 (AbstractOnly). US. 4,308,200, Dec. 29, 1981, “Extracting Tall Oil and Turpentine . . . using Supercritical Carbon Dioxide” (AbstractOnly). JP.63-297499, Dec. 5, 1988, “New Chrysanthemum Extract Prepn . . . Supercritical Pressure” (Abstract Only). Henkel,DE 3,319,184,Nov.29,1984,“Sepn.ofAller ‘genie . . .SupercriticalCarbonDioxide,”(Abstract Only). '(Listcontinuedonnextpage.) Primary Examiner—Philip R. Coe ' Attorney, Agent, or Firm-Joel J. Hayashida; Michael J. Mazza; Harry A. Pacini [57] ABSTRACT A drycleaningsystemparticularlysuitedforemploying supercritical CO2 as the cleaning ?uid consisting of a sealable cleaning vessel containing a rotatable drum adapted for holding soiled substrate, a cleaning ?uid storage vessel, and a gas vaporizer vessel for recycling used cleaning ?uid isprovided. The drum ismagneti cally coupled to a motor so that itcan be rotated during thecleaningprocess.Thesystemisadaptedforautoma tion which permits increased energy ef?ciency as the heating and cooling effect associated with CO2 gas condensation and expansion can be channeled to heat and cool various parts of the system. 3 Claims, 3 Drawing SheetsPDF Image | LIQUID SUPERCRITICAL CARBON DIOXIDE DRY CLEANING SYSTEM
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