公开(公告)号：US20190242861A1

公开(公告)日：2019-08-08

申请号：US16270410

申请日：2019-02-07

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Lisa Croll ,  Duane D. Fansler ,  Hae-Seung Lee ,  John Christopher Thomas

IPC: G01N31/22 ,  A62B18/08 ,  A62B19/00 ,  C09J7/26 ,  C09J7/38 ,  C09J7/35

CPC classification number: G01N31/223 ,  A62B18/088 ,  A62B19/00 ,  B01D27/08 ,  B01D35/143 ,  C09J7/26 ,  C09J7/35 ,  C09J7/381

Abstract: A patterned chemical indicator with at least one indicating zone and at least one reference zone. The reference zone has a first and second major surfaces that are occluded surfaces; and, a reference area of the reference zone is circumferentially bounded by at least one non-porous dam.