Stair climbing device

United States of America Patent

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Jul 19, 2011
Grant Date
May 6, 2010
app pub date
Mar 16, 2007
filing date
Mar 16, 2007

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Expired

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Abstract

The present invention provides a device for safely and conveniently conveying an object on a slope. The safety feature includes a fail-safe one-way brake comprising a ratchet wheel, a pawl and a biasing means. In one embodiment, the device is foldable; in another embodiment, the device is integrated with a suitcase; in yet another embodiment, the device is motorized.

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Patent Owner(s)

Patent Owner	Address
NANYANG POLYTECHNIC	SINGAPORE SINGAPORE SINGAPORE CITY SINGAPORE

International Classification(s)

B62B:HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMB....

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Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
A/L, Lynkaran Kannappan@Suresh	Singapore, SG	1	6
Wong, Chin Sai	Singapore, SG	1	6

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Stair climbing device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

12531491

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PATENT NO	7980337
APP PUB NO	20100108412A1
SERIAL NO	12531491
DOCKET NO

US Family Size	Non-US Coverage
Patent Longevity Expired	Forward Citations

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
July 19, 2011	US,7980337,B2 US7980337B2	GRANTED PATENT AS SECOND PUBLICATION
May 06, 2010	US,20100108412,A1 US20100108412A1	FIRST PUBLISHED PATENT APPLICATION

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12531491

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