Ladder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 11, 2014
Grant Date -
Jan 20, 2011
app pub date -
Dec 29, 2008
filing date -
Dec 29, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A ladder comprises two stiles and at least a step unit mounted between the two stiles. The step unit includes a hollow step, an inner sleeve and an outer sleeve. The inner sleeve is fit into the hollow step, at an end of which a position restriction portion is located to prevent the inner sleeve from moving out, and the outer sleeve is adapted to surround the end of the hollow step. Besides, a fastener is set, the fastening end of which is passed through the stile, the outer sleeve and fastened in the inner sleeve. The present technique solution has a high supporting strength and a high shear resistance.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2008 Application Filing Year
- E06C Class
- 44 Applications Filed
- 25 Patents Issued To-Date
- 56.82 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 20 Citation Count
- E06C Class
- 92.98 % this patent is cited more than
- 11 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 11, 2025 |
