US 12,142,418 B2
Wireless charging coil
Arthur Kurz, Mountainside, NJ (US); Bernard Duetsch, Bound Brook, NJ (US); and Joshua Kurz, Jersey City, NJ (US)
Assigned to A.K. Stamping Company, Inc., Mountainside, NJ (US)
Filed by A.K. Stamping Company, Inc., Mountainside, NJ (US)
Filed on May 10, 2021, as Appl. No. 17/316,519.
Application 17/316,519 is a continuation of application No. 15/860,142, filed on Jan. 2, 2018, granted, now 11,004,598.
Application 15/860,142 is a continuation of application No. 14/470,381, filed on Aug. 27, 2014, granted, now 9,859,052, issued on Jan. 2, 2018.
Claims priority of provisional application 62/004,587, filed on May 29, 2014.
Claims priority of provisional application 61/908,573, filed on Nov. 25, 2013.
Prior Publication US 2021/0265109 A1, Aug. 26, 2021
Int. Cl. H01F 41/04 (2006.01); H01F 27/28 (2006.01); H01F 27/36 (2006.01); H01F 38/14 (2006.01); H01F 41/074 (2016.01); H04B 5/79 (2024.01)
CPC H01F 38/14 (2013.01) [H01F 27/2847 (2013.01); H01F 27/2852 (2013.01); H01F 27/2871 (2013.01); H01F 27/366 (2020.08); H01F 41/04 (2013.01); H01F 41/074 (2016.01); H01F 27/36 (2013.01); H04B 5/79 (2024.01); Y10T 29/49073 (2015.01)] 18 Claims
OG exemplary drawing
 
1. A method of making a wireless charging coil comprising:
stamping a metal sheet to form a first coil having a first spiral trace with a rectangular cross-section, the first spiral trace defining a first space between windings; and
stamping a metal sheet to form a second coil having a second spiral trace with a rectangular cross-section, the second spiral trace defining a second space between windings; and
interconnecting the first stamped coil and the second stamped coil to form a planar coil assembly, such that the first stamped coil is positioned within the second space of the second stamped coil, the second stamped coil is positioned within the first space of the first stamped coil, the first stamped coil and the second stamped coil are positioned in the same plane, and the planar coil assembly has a fill ratio greater than 65%.