Automatically switching dual air filter
Description
Portions of the article shown in broken lines form no part of the claimed design.
Claims
The ornamental design for an automatically switching dual air filter, as shown and described.
Referenced Cited
U.S. Patent Documents
D281618 | December 3, 1985 | Grube |
D365389 | December 19, 1995 | Williams |
D375546 | November 12, 1996 | Lee |
D398975 | September 29, 1998 | Nystrom |
5800581 | September 1, 1998 | Gielink |
6039778 | March 21, 2000 | Coulonvaux |
D423659 | April 25, 2000 | Schippanoski |
D438214 | February 27, 2001 | Gieseke |
D471623 | March 11, 2003 | Gieseke |
D499177 | November 30, 2004 | Kosmider |
D501248 | January 25, 2005 | Chi-Hsiang |
6955701 | October 18, 2005 | Schrage |
D516687 | March 7, 2006 | Shapiro |
D716427 | October 28, 2014 | Lim |
Patent History
Patent number: D820963
Type: Grant
Filed: Apr 20, 2016
Date of Patent: Jun 19, 2018
Inventor: Abraham Wipf (Mitchell, SD)
Primary Examiner: Sheryl Lane
Assistant Examiner: Samantha N Wood
Application Number: 29/561,832
Type: Grant
Filed: Apr 20, 2016
Date of Patent: Jun 19, 2018
Inventor: Abraham Wipf (Mitchell, SD)
Primary Examiner: Sheryl Lane
Assistant Examiner: Samantha N Wood
Application Number: 29/561,832
Classifications
Current U.S. Class:
Filter (D23/365)