Document 3Q61zG0vmar9xZaV3zDV4kyQx

F. O. CASE MANAGER OF MfOWEST OlSTRICT December 21st, 1939 20 N.WACKCR DRIVE CHICAGO. ILLINOIS 1'r. Frederick Laist, Vice-President, v International Smelting and Refining Company, 25 Broadway, New York City. Dear Hr. Laist: cL. ,\ Attachptf you will find a copy of an affidavit and a letter to Mr. James W. Laist, pertaining 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. FOC:vie cc: Mr. G. E. Johnson enclosure N11308 at ATS Of DDIASA COBSTY Of un } j 5j j J JOHSDOH ET At. Ai>?UCATIC S*K1AL BO. 178,352, VG3I i:rro03 of p h o j a c ih c ram LEAD WILLIAM J. XNQX, 73., o m of ths abcrs-nansd petitioners, being duly sworn, deposes end ssyi that the asthod described la ths aboTs application Is aa laprorsnsat oyer other method* ased la th production of Whits toad by ths slectrolytlo process for tho reasons JPI3ST - Tho oorllor oothodo scold aot ho controlled with sufficient precision to produce a prodact of uniform chemical eoepoeltlas, ahleh la tan led to tho prodaetlcm of products of widely Ttrjls* and uncertain physical composition. Tho offoot, for example, of variances la chemise! composition oa tho Important physlaal preparty of oil absorption of Whits toad shea It Is asod os s palat pigaeat Is show is tho feilowiag Uhls. Xha eaapsrlooa of tho oil absorption or oil taking propsrtlos Is ends by tho three methods aost soosoaly used by polat technologist# la dstsrslalng the saount of oil required to product a palat of brushing soaslstoaey. T*sr.s so.i Product 9Am Prodaot "B" Prodaet C*r Analytic rPercentCO, 11.19 * PbC03 67.70 * Pb{0H)g 52.30 Primary Oil Absorption fgms/lGOee) 13.5 Caaslatsaey (Strcmer-ijrtfbb* Balts 38$ oU)9.S Flos (Gardner flea meter, 39$ oil] 2.8" 11.75 71.20 88.81 11.5 9. H 8.75" 12.40 75.50 84.80 B.5 7.48 a.e It oan ho ssaa froa tho foregoing data that s product suhjsot to sush ,id Ttrlatlra, sad mixtures of such products, would ba undaalrabls caeaereisily. Ths nan-uniformity of ths White toad prodoood by theca oarllar aothods ass doe to ths lag la tho seqpehOp of areata lsrolrsd la ths asthods f ooatrol thsa saplsyed. Thsso asthods wars based oa ragolstlng ths ehsalsal aoapaaitloa of ths Whits Lead by ths ratio of carbonate to hydroxide loa eeotsats of tho olootrolytlo cell cetholyte. Tho chain of events laTOlrad la this N11308.01 PNY C0C008465 ****** ** ***1 n h i - U) Titration of Mtbolyte at fn^nt utemU. {*) Mjutittt #f nrtouilos fit 4ujtr to iuntN or Imimh 4oc^** of eortMawtlaa of eatbolyte. (3) Tine retired to displace old eatholyt* 1* atarS Uiti, piping, sad milt by nos catholyta of adjusted earboante-to-hydroxlde ratio. (<) Tise of adjustment of cospoaltloo of analyte by rio* of catholyta ioaa of nes ratio from eatbolyte to analyte octapartiient of sell. (9) 71m in volved la laboratory analysis la cheeking relationship batman ratio and aompositten of prodaet shleh as* feuad to vary alth changes la sail temperature, rate of flow of sell electrolyte, aad other motors. 3KCC35D - Tha laproraaeat over tba aarllar methods by the laTaatloa covered la ?atant Ho. 1,849,713 sea found to be eomjlleeted to operate, dee to tba sseesalty of axact neutralisation or accurate deficient carbonatloa of tba catholyta. Tbl complication added to tba expense, la that additional operetta* personnel sea reqalrsd to make frequent titrations of tba eatbolyte. TT-.1SS - That tba method of tbla application has resulted la permitting eocpleta control of tba ooaposltloo of tha product end simplification of tha operating procedure. Some of tha operating leproreaento that hare resulted fro* tha diaeovery of thla saw method are llatad belowi- (1) Xlimlaatlen of tba tine lag from tba Mtbods of control by a diraot adjustment of tba bicarbonate contents of tba anolyta. (2} Poaltiva acs>trol of tba composition of the shite Load by directly controlling tha hlaarbouta eootaata of tha anolyta. (3) Simplification of eoatrol, la that only tha one operation of varying tha volume of aa alkaline aolotleo flotrlr^ into tha anolyta la Involved, and this la accomplished by Barely changing tha setting on one valve. (4) Complete utilisation being aada of tba discovery that tha eompoalttoo of tha 7hita load varies directly vltb the biearbonats oontanta of tha anolyta. FOURTH - That thla nas aathod of control has greatly decreased tha opera time seat.- Some of theca earrings era llatad balest- (1) Reduction of coat of required ohaaloels to a minimum, slnaa la tha aaaaa cited, ahara chomleals are added, tbaaa ehanlaala are lass expensive than those used In tha Mtbods aT refareaosi aad In tha ease altad ahara undersettosaatsd eatbolyte Is used as a souroa of alkali, no nas ahaxleala are required. (!) Redaction in number of man required to operated tha proeeas. for axanpla. PNYC00G08466 b*a eoatrolllag tha operation of a tan* roan containing farty-alght )) , V/ th* nathods of rafarena*, 1. required on* circulation nan, emm titration csa, and ts asll ami but when operated by th *athod of this application, only oee circulation ** and one eall ana Is required. ( IT ->1. SafcaerlWd end mom to before sa this /, 5'^'li.n of Eoeeaber, 1939 notary Public Mr 1 *%-* *- 5. I*** ttZ/m 12/13/59 PNYC00008^67