摘要 |
PCT No. PCT/GB93/01386 Sec. 371 Date Jan. 23, 1995 Sec. 102(e) Date Jan. 23, 1995 PCT Filed Jul. 1, 1993 PCT Pub. No. WO94/02329 PCT Pub. Date Feb. 3, 1994A means of identification or document of value which includes a paper or polymer region, in particular, bank notes, passports, identification cards or any other document of sufficient value to make it liable to be copied or counterfeited, includes a watermark in the region and a liquid crystal material applied to the region and to at least a part of the watermark to produce optical effects which differ when viewed in transmitted and reflected light. |
申请人 |
PORTALS LTD., BASINGSTOKE, HAMPSHIRE, GB |
发明人 |
KNIGHT, MALCOLM ROBERT MURRAY, BASINGSTOKE, HAMPSHIRE RG25 2BP, GB;ISHERWOOD, ROLAND, WHITCHURCH, HAMPSHIRE RG28 7QJ, GB;NELSON, CRAIG HARVEY, BALDOCK, HERTS SG7 6TJ, GB;ROCCA, SARAH ANNE, GIRTON, CAMBRIDGE CB3 0NN, GB;GODFREY, ROBIN EDWARD, WELWYN, HERTS AL6 0RY, GB |