Air filter

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FIG. 1 is a front top perspective view of an air filter according to the new design;

FIG. 2 is a rear bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in the drawings show portions of the air filter that form no part of the claimed design.


The ornamental design for an air filter, as shown and described.

Referenced Cited
U.S. Patent Documents
D401684 November 24, 1998 Shelton
D438214 February 27, 2001 Gieseke
D471623 March 11, 2003 Gieseke
D652496 January 17, 2012 Greenlees
D713023 September 9, 2014 Chen
D763426 August 9, 2016 Koch
D770592 November 1, 2016 Schwartz
D793544 August 1, 2017 Ramirez
D808506 January 23, 2018 Koch
D844103 March 26, 2019 Yoshita
Patent History
Patent number: D897517
Type: Grant
Filed: Apr 25, 2018
Date of Patent: Sep 29, 2020
Inventors: Christopher Wolf (Brown Deer, WI), Eric B. Hudak (Sheboygan, WI), Michelle Formanek (Sheboygan, WI), Michael E. Smies (Waldo, WI)
Primary Examiner: Lakiya G Rogers
Assistant Examiner: John A Voytek
Application Number: 29/645,343
Current U.S. Class: Filter (D23/365)