US 12,421,427 B2
Patterned surfaces with suction
Lukas Bluecher, Eurasberg (DE); and Michael Milbocker, Holliston, MA (US)
Assigned to BVW Holding AG, Cham (CH)
Filed by BVW Holding AG, Cham (CH)
Filed on Jun. 17, 2022, as Appl. No. 17/842,946.
Application 17/842,946 is a continuation of application No. 16/524,367, filed on Jul. 29, 2019, granted, now 11,390,778.
Claims priority of provisional application 62/711,545, filed on Jul. 29, 2018.
Prior Publication US 2023/0020566 A1, Jan. 19, 2023
Int. Cl. B32B 3/26 (2006.01); B32B 3/28 (2006.01); B32B 3/30 (2006.01); C09J 7/20 (2018.01); C09J 7/38 (2018.01)
CPC C09J 7/38 (2018.01) [C09J 7/20 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A substrate having a microstructured surface for adhering to a target surface via a liquid interface, the substrate comprising:
a planar surface with at least a first microstructure pattern disposed about the planar surface, the first microstructure pattern including a first plurality of micropillars having a diameter of at least 15 microns, a height of at least 75 microns, and a pitch between adjacent micropillars of at least 20 microns, and wherein the cross-section of each micropillar of the first plurality of micropillars being tapered from an upper portion to a lower portion of each micropillar of the first plurality of micropillars;
wherein the planar surface further comprises an exterior and an interior, wherein a set of a plurality of holes are disposed about the exterior and projecting into the interior such that the plurality of holes has a fractal dimension between 0.25 and 0.70; and
wherein the at least first microstructure pattern is capable of generating a Wenzel-Cassie wetting state when interfacing with the target surface in the presence of a fluid and includes a lateral aspect ratio between 0.1 and 10.