US 12,263,423 B2
Micro-machined filter for magnetic particles
Babar Khan, Ossining, NY (US); and Emily R. Kinser, Poughkeepsie, NY (US)
Assigned to International Business Machines Corporation, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on May 17, 2023, as Appl. No. 18/318,762.
Application 18/318,762 is a division of application No. 17/130,029, filed on Dec. 22, 2020, granted, now 11,684,878.
Application 17/130,029 is a division of application No. 16/129,849, filed on Sep. 13, 2018, granted, now 11,161,066, issued on Nov. 2, 2021.
Prior Publication US 2023/0285879 A1, Sep. 14, 2023
Int. Cl. B01D 35/06 (2006.01); B01D 39/16 (2006.01); B01D 39/20 (2006.01); B03C 1/033 (2006.01); B03C 1/28 (2006.01)
CPC B01D 35/06 (2013.01) [B01D 39/1692 (2013.01); B01D 39/20 (2013.01); B01D 39/2003 (2013.01); B03C 1/033 (2013.01); B03C 1/288 (2013.01); B03C 2201/18 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A filter system for filtering magnetic particles, the filter system comprising:
a micro-machined filter comprising:
a plurality of pores within a substrate; and
a magnetic liner arranged on sidewalls and a bottommost surface of pores of the plurality of pores;
a coating directly on the magnetic liner, the coating comprising a ligand for the magnetic particle of interest, the ligand positioned such that the magnetic liner is between the ligand and the sidewalls or bottommost surface of the pores; and
wherein a pore of the plurality of pores has a width that is greater than a magnetic particle of interest, such that the magnetic particle of interest binds to the magnetic liner within the pore.