(19)
(11) EP 0 334 856 A1

(12)

(43) Date of publication:
04.10.1989 Bulletin 1989/40

(21) Application number: 87907248.0

(22) Date of filing: 12.11.1987
(51) International Patent Classification (IPC): 
G02B 5/ 12( . )
G02B 5/ 126( . )
 G02B 3/ 00( . )
(86) International application number:
PCT/GB1987/000806
(87) International publication number:
WO 1988/003659 (19.05.1988 Gazette 1988/11)
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 13.11.1986 GB 19860027125

(71) Applicant: THE UNIVERSITY OF SHEFFIELD
Sheffield, South Yorkshire S10 2TN (GB)

(72) Inventors:
  • DAVIES, Neill
    Snaith, nr. Goole (GB)
  • McCORMICK, Malcolm
    Sheffield (GB)

(74) Representative: Houghton, David 
Hulse & Co. Eagle Star House, Carver Street
Sheffield S1 4FP
Sheffield S1 4FP (GB)

   


(54) RETROREFLECTING MEANS