(19)

(11)

EP 0 051 585 A1

(12)

(43) Date of publication: 19.05.1982 Bulletin 1982/20 (21) Application number: 80901511.0 (22) Date of filing: 09.05.1980

(51) International Patent Classification (IPC):  G03D 9/ 00( . ) (86) International application number: PCT/US1980/000560 (87) International publication number: WO 1981/003232 (12.11.1981 Gazette 1981/27)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (71) Applicant: BYERS, Thomas L. Oklahoma City, OK 73159 (US)	(72) Inventor: BYERS, Thomas L. Oklahoma City, OK 73159 (US)