Document zQDmx06bgZkNk2vw2zM8NdMen

Wil l ia m H.Da v is Ar e a B. Ma r v in - mco De a n S-Ed mo k d s Fb a n k E.Ba r bo w s w . Br o w n Mo r t o n Me r t o n W. Sa o e Wi u is HTa y l o b .Jb . Er n e s t fl. Me h c k a n t Ge o h o e .Mid d l e t o n Mo r r is p. Ja c k s o n ' R.Mo r t o n Ad a ms Ra y mo n d F. Ad a ms Le s l ie B-Yo o n o Da n ie l V. Ma h o n e y D4947 Co u n s e l l o r s a t La w 165 Br o a d w a y Ne w Yo r k Wa s h in g t o n Of f ic e s Na t io n a l Pr e s s Bu il d in o January 3, 1941 S.Ho w -e l l Br o w n . Jh . Lo u is D.Fo r w aa s H.St a n l e y Ma n s f ie l d Ge o h o e EFa it h f u l l Do n a l F.M?Ca s t h t Ha l E Se a o r a v k s Jo h n Ho x iz Jo h n T. Pa r l e y Cu r t Vo n Bo e t t ic r i.Jb . Ja me s B-Ck r is t x e Ja me s W. La is t Cy h u s S.Ha p o o o d Ro o e r T.M'Uu h Ha r o l d AT&a v e h Me r t o n S.Ne il l w\ Pe t e r s Bl a n c Fr e d e r ic k L.Bis s in o e r Ke n n e t h E.Mu r r a y Ca r l ERin o W. B. Mo r t o n , J*. Mr. Frederick Laist, Vice-President International Smelting and Refining Co. 25 Broadway (Room 1720) New York, N. Y. / / 3 /v-1 Dear Sir: Re: Johnson et al. Application, Ser. No. 178,352, For: Method of Producing White Lead This is to advise you that we have filed the amendment and the affidavit executed by Mr. Knox in response to the Office action of August 6, 1940, in the above-identified application. Two copies of the amendment and affidavit as filed are enclosed herewith. Very truly yours, Copy of letter with enclosures sent :.ir. Case - l/C/41 P*"C00e420 D4947 78*0 IN THE UNITED STATED PATENT OFFICE In re application of CUNNARD I. JOHNSON, REGINALD G. BOWMAN and KILLIAN J. KNOX, JR. Serial No. 178,382 Piled December 6, 1937 CIy . 56 - Room 4725 s : I METHOD OF PRODUCING j WHITE LEAD : : New York, N.Y., Deo. 31, 1940 Honorable Commissioner of Fatenta Washington, D.C. S1R i In reaponae to the Offioe Action of August 6, 1940 pleaae amend the above-identifled application as follows: Claim 4, last line, change the period to a comma and add --whereby the composition of the precipitated white lead ia controlled without the building up of an excess quantity of iona in the electrolyte.--; Claim 8, last line, before the period insert --in auoh an amount that the quantity of alkali metal iona in the electrolyte ia not increased at a rate in excess of the rate at which alkali metal iona are lost from the electrolyte in the course of normal operation of the cell--j Claim 11, laat line, before the parlod insert --without building up an undesirable quantity of ions in the electrolyte--. PNYC000G8A21 N11215.01 H 3M ARK3 Reconoideratlon of this application in its amended form is respectfully requested. The affidavit of William J. Knox, Jr., filed concurrently wit* *he supplemental amendment dated December 27, 1939, showed that the control method of the present invention is superior to the oontrol method embodied in procedure (1) of the Johnson et al patent. The Offloe Action of August 6, 1940 states that comparison "should have been made with processes 2 and 4 of the reference (page 1, lines 39-SO), in neither of whioh is It necessary to titrate the catholyte, adjust the C0g damper, or rely on flow of catholyte through the diaphregc." Accordingly, a second affidavit of William J. Knox, Jr., one of the applicants in the above-identified application, is being filed concurrently herewith for the purpose of showing the superiority of the oontrol method of this application over procedures (2) and (4} of the Johnson et al patent. The affidavit points out that the method of oontrol represented by procedures () and (4) of the Johnson et al patent are not commercially feasible. With these methods of oontrol the acetate lone in the ease of procedure I (2) and tha sodium Ions in the case of procedure (4) must be ; added in substantial excess of the normal operating loae | of these ions in order to seoure effective oontrol of the i I j! bicarbonate Ion concentration in the enolyte. The affidavit further points out that the building up of suoh ions in the ! electrolyte requires discarding of a portion of the electrolyte in order to permit dilution of the remaining electrolyte up to the volume limited by the capaoity of plant equipment. 2. PNYC00008A22 | Tbs cost of tbs reagents thus discarded is so great that tbs | methods of oontrol which build up ions in the eleotrolyte at i a rats greater than the rats at which these ions are lost in tbs oourse of normal osll operation (procedure (2) and (i} of tbs Johnson et al patent) cannot be employed in ! operation. j It it e fact that the oontrol method defined in the claims of tbs present application is not described in tba Johnson et al patent. The attached affidavit, together with the previously filed affidavit,ahow the advan tage of the present control method over procedures (1), (2) and (4) of the Johnson et al patent. Procedure (3) of this references is not pertinent to the claims of the present application. It is submitted, therefore, that oleins 2, 4, S and 11 which define applicants* novel and superior con trol method patentably distinguish over the patent to Johnson at al and the other referanoes of record, Keferanoe has been mads in the last Offioa Action to the patent to Kosenstein as showing the adjustment of bicarbonate ion concentration by the addition of alkali. However, the Kosenstein patent merely describes the use of sodlua bi carbonate as a buffer salt in controlling hydroxide Ion concentration in a non-analogous ohamioal raeotion, and there is no suggestion in this patent that hydroxide Iona (obtained by the addition of an alkali) would be effaotire In the control of the bicarbonate ion concentration in the electro lytic productim cf white lead. Claims 4, 5 and 11 have bean amended to emphasize the fact that an undesirable quantity of Iona la not built 3. PNYC00008A2B up In the electrolyte by the control method defined In the ! oleine. This is a result which is not accomplished by any of the references of record. It is submitted, therefore, that clains , 4, 6 end 11 clearly end patentably define over the reference# of record and that the application is now in condition to be peaaad to issue. favorable reconsideration and early allowance are respectfully requested. Jlespeotfully submitted. Attorneys for Applicants. 4 Pn ^o o 0o