(19)

(11)

EP 0 236 055 A3

(12)	EUROPEAN PATENT APPLICATION

(88) Date of publication A3: 07.10.1987 Bulletin 1987/41 (43) Date of publication A2: 09.09.1987 Bulletin 1987/37 (21) Application number: 87301612 (22) Date of filing: 24.02.1987

(84) Designated Contracting States: AT BE CH DE ES FR GB GR IT LI LU NL SE (30) Priority: 24.02.1986 US 831905 (71) Applicant: ENGELHARD CORPORATION  ()	(72) Inventors: Bartholic, David B.  () Barger, Dwight F.  ()