US 12,268,255 B2
Device for dynamic fluid pinning
Michael Milbocker, Holliston, MA (US); and Lukas Bluecher, Eurasberg (DE)
Assigned to BVW Holding AG, Cham (CH)
Filed by BVW Holding AG, Cham (CH)
Filed on May 4, 2021, as Appl. No. 17/307,525.
Application 17/307,525 is a continuation of application No. 16/146,877, filed on Sep. 28, 2018, granted, now 11,051,567.
Claims priority of provisional application 62/564,783, filed on Sep. 28, 2017.
Prior Publication US 2021/0251318 A1, Aug. 19, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 3/30 (2006.01); A41D 19/00 (2006.01); B08B 17/06 (2006.01); B32B 27/08 (2006.01); B81C 1/00 (2006.01)
CPC A41D 19/0082 (2013.01) [B32B 3/30 (2013.01); B32B 27/08 (2013.01); B81C 1/00206 (2013.01); A41D 2500/50 (2013.01); B81B 2201/058 (2013.01); B81B 2203/0361 (2013.01); B81B 2207/056 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device comprising a microstructured surface having at least two hierarchical levels that are self-similar, including a first level and a second level, each of the first and second levels include microfeatures wherein the first level microfeatures have a width of 1 to 20 microns, a height of 1 to 20 microns, and a pitch between adjacent microfeatures of 1 to 20 microns, the second level microfeatures have a width of 10 to 500 microns, a height of 50 to 200 microns, and a pitch between adjacent microfeatures greater than 50 microns up to 200 microns, the first level being disposed about the second level, the height and the width of the first and second microfeatures being scaled by a constant factor, the at least two hierarchical levels produce Wenzel-Cassie fluid pinning states when placed in contact with a wet surface,
wherein the microstructured surface comprises a first plurality of the at least two hierarchical levels and a second plurality of the at least two hierarchical levels, wherein the first plurality is positioned at a first height about the microstructured surface, and the second plurality is positioned at a second height about the microstructured surface, wherein the first height and second height are different and create split contact levels capable of generating split contact Wenzel-Cassie wetting states.