(19)

(11)

EP 0 022 780 A1

(12)

(43) Date of publication: 28.01.1981 Bulletin 1981/04 (21) Application number: 79901069.0 (22) Date of filing: 22.01.1979

(51) International Patent Classification (IPC):  G03B 27/ 10( . ) G03B 27/ 62( . ) (86) International application number: PCT/US1979/000060 (87) International publication number: WO 1980/001519 (24.07.1980 Gazette 1980/17)

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