Document BQvqDngBpvV1g5OGJovboNX

Op f ic e o p t h e v ic e Pr e s id e n t 25 Broadway V-:-; K/'S^ ': -> New York Juno 21, 1333. Ur. Donal F. McCarthy, Perrnie, Davis, Marvin & Edmonds, 165 Broadway, New lor'-- ' * " ", Ret U.3. PATENT APPLICATION 07 UE3GRS. JOHNSON, BOWMAN, AND KNOX, SERIAL NUMBER 178,352. FILED DECEMBER 6, 1937. FORt METIDD OF PRODUCING WHITE LEAD. Dear Mr. McCarthy! Referring to your letter of May 10th in connection with the above noted patent application, I am sending you herewith copy of letter from Hr. Knox, which is self-explanatory. lours very truly. G Enc. # PNYCOC006A90 INTERNATIONAL SMELTING AND REFINING COMPANY F. O- CASE MANAGER Or MIOWCST DISTRICT An / from m i dA ZO N.WACI1EB Dmue CHICAOO. ILLINOIS June 1?, 19?9 hr. Frederick Lrist, Vice-President. Intern--1 tier a 1 Sndtin" 2r- Brof.cv.-gy f Nev/ York Citv. Peep Mr># Lcieij Pbfipin^ Co'inany, I an enclo.cipc fo ccoie? of a letter from Mr. Knot: rdorriri to U. S. Patent aoplicrtion Serif.! !"i;r.ber 17? ^52. Y.'e h-v<> been over this proposition at Prst Chic? "O, but other than Mr. Kr.or.'? corr'cnts, nothin: is renuirod. Fe all hope that it nill be possible For the attorneys to nircue this riptter further and ret a patent of r.t least nominal value. FOC:vlc ends PNICOOOC^91 N11450.01 June leth, 1939 Ur. 7. 0. Case, Manager of Midwest District, International Smeltg. and Refg. Co., SO North Waokar Drive, Chicago, Illinois. SOBJSCTi U.3. Patent Application.of--Usance Johnson, Bowman, and Knox, 3erlaT~iabs> 1TB.3BS. Plied December 6th, 1937. 'sV Pori Method of PpodSdiug White Lead*\ Dear Ur. Oaeei- Relative to Patent Office actlo^/dated April 22, 1939 In the above noted ease which was wdrphrded to Ur. Lalst bp Ur. McCarthy on May 10th$ The Patent claims, (claims S, 4 disclosure", and (b) Discussion of the po jeeta the remaining the basis of, (a) "Insufficient er Johnson et al, of record", lows! (a) KxcSUIya carhohatl-olt.-ibejr be defined as oarbonatlon In excsss of/ih&t required t<THlntaln the blaarbonate concentration of the anolyte at the^tslred concentration, without attesting to eontxjol the exact amount of this excess. The finer or mare exaot control kh then obtained by adding hydroxide Iona to the anolyte In the exact, amount required. By''thiv'mstho4, the extremely difficult method formerly employed, of attempting to obtain control through controllng the degree of oarbonatlon of the catholyte, is eliminated, and a simple and more direct means of control Is substituted. (b) The Johnson Patent covers the addition of an acid to the anolyte and maintaining a uniform and deficient carbonated oatholyte. The present Invention Is therefore not anticipated, as it Is not neoessary to smlntaln the degree of oarbonatlon of the oatholyte uniformly constant. The steps used In Rosensteln have no bearing on the present Invention. PNrCOOOOd^.92 N11450.02 Sheet #2 - Mr. y.O.Case June 16th. 1939 The advantage of this invention aas unexpected, la that It bad been assumed for years that elose control could only be obtalaed through control of the carbonatloa of the oatholyte; this control as difficult and ms unexpectedly simplified by the discovery disclosed In this application. I wish to suggest that the patent attorneys also consider the advantage of re-opening some of the claims vhlcilwere cancelled. These claims, I believe, were cancelled without pre [tidies. The prosecution of this application should be continued mill pesaed to issue, as this application and patent #1 .Sdg^tS^-rt^gned to the International Smelting and Refining Company, wUlprtxvMe the needed process patent coverage of the white l^p&^process. \\ WJX/lb Knox PIant^Superintendent PNYC00C0Q493