Stair climbing wheel system

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Description

FIG. 1 is a perspective view of a stair climbing wheel system showing our new design;

FIG. 2 is a top view of the stair climbing wheel system, the bottom view, front side view, and rear view being identical to the top view, and thus are not shown; and,

FIG. 3 is a right side view of the stair climbing wheel system; the left side view being identical to the right side view and thus is not shown.

Claims

The ornamental design for stair climbing wheel system, as shown and described.

Referenced Cited
U.S. Patent Documents
2400824 May 1946 Jackson
2706640 April 1955 Marshall
3920255 November 1975 Siddoway
4061199 December 6, 1977 Last
4264082 April 28, 1981 Fouchey, Jr.
4687213 August 18, 1987 Ridderstolpe
D299953 February 21, 1989 King et al.
4919489 April 24, 1990 Kopsco
D318358 July 16, 1991 Cowlin
D340340 October 12, 1993 Allen
D340341 October 12, 1993 Lawless et al.
5273296 December 28, 1993 Lepek
D413420 August 31, 1999 Nimmo et al.
6029982 February 29, 2000 Kakehi et al.
6644675 November 11, 2003 Ellis et al.
6926287 August 9, 2005 Maher
Patent History
Patent number: D540503
Type: Grant
Filed: Dec 16, 2005
Date of Patent: Apr 10, 2007
Assignee: Ultrabright Limited (Sheung Wan)
Inventor: Wai Kay Tsang (Sheung Wan)
Primary Examiner: Cynthia E. Ramirez
Attorney: Nixon Peabody LLP
Application Number: 29/244,982
Classifications
Current U.S. Class: Conveying, Lifting, Or Transferring Article (D34/28)