(19)

(11)

EP 0 023 288 A3

(12)	EUROPEAN PATENT APPLICATION

(88) Date of publication A3: 01.04.1981 Bulletin 1981/13 (43) Date of publication A2: 04.02.1981 Bulletin 1981/05 (21) Application number: 80103859 (22) Date of filing: 07.07.1980

(84) Designated Contracting States: BE DE FR GB IT (30) Priority: 06.07.1979 US 55659 06.07.1979 US 55232 06.07.1979 US 55234 06.07.1979 US 55231 06.07.1979 US 55233 06.07.1979 US 55247 (71) Applicant: PHILLIPS PETROLEUM COMPANY  ()	(72) Inventors: Eddy, William Robert  () Tylor, Raymond Charles  () Young, Jerry Wayne  ()