公开(公告)号：US3604781A

公开(公告)日：1971-09-14

申请号：US88004669

申请日：1969-11-26

Applicant: BASF AG

Inventor： GAETH RUDOLF ,  HAGEN KARL ,  ORTHMANN HANS-JOACHIM ,  LINN KARL GUSTAV

IPC: E01F9/40 ,  G01K11/06 ,  G02B5/12

CPC classification number: G02B5/12 ,  E01F9/40 ,  G01K11/06

Abstract: A reflector containing a light-reflecting layer, particularly for affixation to road edge marker posts, for warning traffic of the existence of icing conditions. The reflector consists of a transparent capsular container located in front of a lightreflecting layer and filled with a liquid which extends over the surface of the layer, and which as a result of a change of state loses the transparency it possesses at higher temperatures when temperatures just above the freezing point of water prevail.