Document QYrq9kJNgDqjM0GVxQE0N7a5

INTERNATIONAL SMELTING AND REFINING COMPANY F. p- CASE MANAGER OF1 MIOWCST OlSTRICT An from i dA 20 N.WACKCR OR'VC CHICAGO. ILLINOIS December 21st, 1939 Mr. Frederick Laist, Vice-President, v . International Smelting and Refining Company, 25 Broadway, New York City. Dear Mr. Laist: AttachpdTyou will find a copy of an affidavit and a letter to Mr. James W. Laist, oertaining to application serial No. 173,352. Under date of December 19th, Mr. James W. Laist has replied to Mr. Knox so that when you have the enclosed, you will have a complete file. Very truly yoursj FOC:vie cc: Mr. G E. Johnson enclosure / o. N11308 }!$! at ATS OF DTDIASA cousry cf lajct.. } ) 53: i JQBS'JQH ET AL. Ai>?UCATICa S* RIAL BO. 178,352, PGR: l'.rTH03 OF FHOIfcClHC rtiXTZ LEAD XILLIAX J. ZNOX, 73., om of ths sbcrs-neaed petitioners, balag duly sworn, deposes and saya that the astfccd described la tha shore applloatioc la an isproreneat orer othar methods awed la tha produetlc of Whit* Lead by tha electrolytic process for tha reasons:- FIRST - Tha earlier methods could not bo controlled with sufficient precision to produce a prodnet of ualfotm chemical eoapoaltloa, which In torn led to tha production of products of widely rarylag and uncertain physical conpocltlcm. Tha offset, for sraa.pla, of carl*tloan la shaaisal composition on tha important physical preparty . of oil absorption of tfclta toad ahen It la naad as a palat plgasat la show In tha felloelag Uhls. Zha aampcrlaoa of tha oil absorption or oil tsling propsrtlos la made by tha tkraa natboda oat soosoaly used by palat Uchnoloslsts la dstsralnlng tha saount of sU required to produoa a palat of brushing consistency. TA3T.5 K0.1 Prodaot Anslysln rPercent CO, 11.19 * PbCO, 67.70 * Pb(0H)g Prlnary Oil Absorption fgac/icoeo) 32.30 13.9 Consistency (Strasar-Lrdhbs Balts 38$ oi 1)9.25: Flow (Gardner flow molar, 33$ oil) 2.2" Product B" 11.79 71.20 88.81 11.8 9. H 2.79" Product "C" 12.40 75.SO 24.80 0.6 . "7.4S 86 Zt oaa bo sasa fren tha foregoing data that a product subject to such elda arlstlon, ant mixtures of such products, would ha uadaslrabls coeucerclally. Tha aon-ualforaity of tha Thlte taed produced by these earlier natboda was due to tha lag la tha oetaanap of areata larolrsd la the asthoda of control then employed. Thau scthuds were baaed on ragulatlng the chemical oonpealtlca of tha Kbits lead by tha ratio of carbonate to hydroxide Ion cootents of tho olootrolytlo call catholyte. The chain of oranta larolrsd la this N11308.01 Ph'Y C0C008465 551OT7J5WSW: irstlF|]ffW aettot of central nri - (l) Titration of cethelyte at frt^nt UUmli. I*) ddjustmant of carboaatloc fan damper to increesa or decrease degree f eai%owUaa of SW^. (3) Tina required to displace old oatbolyte i* stor es* tanks, piping, aad calls by neu eetholyta of edjuatad cartonata-to-kydroxida ratio. (<) ria* of adjustment of eosposltlon of acolyte by rio* of aalholyta loss of see ratio from cstholyte to anolyta compartment of sell. (9) Tine in volved in laboratory anelyai* la cheeking relationship betvaaa ratio and scn- petition of product vfelcii mas found to vary attk ehsnges la cell temperature, rata of flow of eall electrolyte, aad other motors. ' 32CC35D - The improvement over tba aarllar sotted* by the Invention corerad la Patent Ho. 1,849,713 m found to bo sompllested to operate, dae to tba necessity of exact neutralisation or asourata deficient oarbosatloa of tbo cstholyte. Tbl ooaplleatloa added to tba expense, la that additional operating personnel vaa required to aaka frequent titrations of tbo oatbolyte. TT-.XSS - That tba method of tbla application has resulted In permitting complete control of tbo ooaposltloo of tbo product end simplification of tbo operating proeoduro. Some of tbo operating lnproreaeats that beto resulted from tba diseoYery of tbla new method are listed belovt- (1) Xlialaeticn of tba tin# lag froa tba methods of control by a di rect adjustment of the bicarbonate contents of tba anolyta. (2} Fosltiv* son- troi of tba eeapoaltloe of tbo vhlta Load by directly controlling the bicarbonate contents of tbo anolyta. (3) Simplification of control, la that only tba one oparetic* of varying tba volume of an alkaline eolation flovir^ into the anolyta la involved, end tbla la accomplished by sorely changing tbo setting on one valve. (4) Complete utilisation being made of tbo discovery that tbs composition of tbo 7Kite load varies directly vltb tbo bicarbonate contents of tbs snolyts. FC0S7H - That tbla nsv method of control has greatly decreased tba operettas scat. Sea* of theme earrings ere Hated balest- (1) Reduction of cost of required obsaloals to a alnlmma, since la tba eaaea cited, mborc obaalools aro added, theoe ebaaloala are less expensive than those used la the methods of reference j sad In the case alted share under- eaitcoated oatbolyte Is used as a souroa of alkali, no nee obealoale ere required. {*) Hodnetloa in number of men required to operated tba proaeas. for exaaple. PNYC00G06466 bea eoatrolllag the operatios of a task rooa costalalng forty-sight sella, by the nathode of rafarenea. It required on* eiroolatloa nan, <ma tltretioa earn, and two sail ntt{ but shea operated by tbs asthod of this application, only osa olreulatlea ** sad oas sail tuts la required. ( ITw-.\ - \Ua^?c . ...xA . Subserlbed end non to before so this /. of Eoeeaber, 1939 Hotery Fufello Mr C--mfi.-- *v~<--* J. ?* m/n* 12/13/59 X PNYC000Q8*67