Document QXd3NQBJG2jnaZdZaD3QnEnL7

FILE NAME: WR Grace (WRG) DATE: August 31, 1970 DOC#: WRG121 DOCUMENT DESCRIPTION: 1970 Memo to Armand McMillan regarding patentability of mono-kote plaster compositions M I m ew AS A.WJIBON M IS? PATSNT COUNSO. - 'kmevntnaieotHhpaet.epnrtienecueNsa. W. R. GRACE & CO. PATENT DEPARTMENT LEGAL. DIVISION INTER OFFICE MEMO Afi\ Sfr ^ es9 S-aZ#-H t^ m c ftte t" WPLE.ARSE. RGEPRLAY CT9E. ft CO. clarksville. ms. tis i* to: Ar m a n d M c M i l l a n DATE: A u g u s t 31, 1970 M M . Andrea M. Giardini subject* -atentability Search #3126 - Mono-Xote Plaster Compositions A novelty search has beer, completed in the U. S. P a t e n t Office on the following composition: 1) Gypsum (CaS04 ) ' 2) and/or a lightweight aggregate (vermicullte or perlite) 3) and a cellulosic substance (wood . pulp fiber, methyl cellulose or ' chemically modified r.onfibrous _ . cellulose) *' The class searched was 106/113 (Inorganic settable ingredient containing cellulose or derivative). 1,423,569 1,954,373 2,142,164 2,322,194 2,853,394 3,037,742 ' 3,153,596* 3,215,549* 3,219,112* 3,376,147 US? 3,133,395 appears to 1 'in regard to novelty. The eia: of a mixture of calcium sulfat' methyl cellulose. 2515774A srsr.c? consists : and 16 C 9 3 P L A IN T IF FS EXHIBIT 77 U iM U iW M n fd l  Armand McMillan Page Two ;A u g u s t 31, 1970 * US? 3,219,112 discusses a gypsum hydraulic cement composition mixed with diatomaceous earth and an alkali metal carboxymethyl hydroxyethyl cellulose. US? 3,215,549 discloses similar binding or setting compositions. US? 3,376,147 and 2,853,394 relate to improved fire resistant gypsum wallboards consisting of gypsum, unexpanded vermiculite and glass fiber. ' ' US? 1,423,569 shows that as far back as 1922 "shredded wood fibers" were used in fireproof wallboard compositions. US? 1,954,378 discloses a set gypsum mass having distributed throughout filaments of a water soluble cellulose derivative. In view of the above cited patents, the composition in question does not appear to be patentable. AMGrpe ?D 0-21 G cc: C. L. Harness 2515774 5 16034-