Document 7LYkD6QOVp5kwG4dk1Q7MR0o

I.d u Po n t d e Ne mo u r s 5 Co mp an y IMconponATfttt 1166 Na t io n a l . Pr e s s Bu il d in g s h Tn g t o n , t>.. C. LEGAL DEPARTMENT PATENT DIVISION ItR. D. B. 870HPS PATJEBf DIVISIOH muma mis, t. k x s mm tn ^,0. 311104 hlXTGRIS ewe* w**w mw**** wi * awmr'v ww.m the Oarveth patent 1,838,471 1# elaseified : in 0Um Mmto 148, This j MM&ms a4 mere pertinent *0b 148 asm the only one* Whieh we have toesn atole to examine to date. Patents 1,870,048 and 1,949,781 issued to |> sohextel end assigned to Th. oeldsohmidt Af* relate to the preparation of lead oxide toy flowing Molten lead onto a structure touilt of fire toriok*. Air is blown into tint heated cbaatoer containing tlie structure end the oxide* of lead tto&t fora are blown out. The claims in the first patsnt* 1,870,049 refer to the fire brisk* ae refractive Material and it geests, Might toe infringed toy, elafcfti for, the Beyersderfer :process if they were net 0artfully drawn to avoid the Sor: hertel claims. The pox* arooedure is janato the sen# a* in the pteoessf that la to extend the film of m inert Material so ae to oecmre beet tierne for ooidk oxidation* These patents ee of " * Udn with your onset ion (1) on Mm 27, that le the method of oxid we have M no ether patent of interest in oenneetiea with this question (1). os.ide.-S^aiiioa0oMarixotunrseetMiomn <s) senseming the a peedaet m lev# nOewfll. patent 1,441,18$. This patent concern* a N33749 'PJPOlSSilSt Witlt ytwf tlnfan^aiiw^alyj we fcawe not been able to get' mptm of tbeee |*ateabg,ef posflibla tateae**.;!* time 'to taelode witfc tlile letter* lie will endearo* to a<md fm a eoaplete report ea tbi* search by the end -of the Present week. - AfD:0? DUP050028642