Curved staircase
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United States of America Patent
Stats
-
Dec 12, 2017
Grant Date -
Mar 2, 2017
app pub date -
Sep 2, 2016
filing date -
Sep 2, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A curved staircase including a double helix form with no center support column includes a plurality of stair segments, wherein each of the stair segments is formed from a plurality of rods coupled to a plurality of connecting nodes. The plurality of rods are arranged in a skewed tetrahedral geometry, which causes the plurality of stair segments to form a helical structure when the plurality of stair segments are coupled together. The plurality of rods form a spine on an underside of the plurality of stair segments. A tread is coupled to each of the stair segments. In alternate embodiments, the curved staircase may be formed from sheet metal creased to form a plurality of linear support locations and connecting nodes.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2016 Application Filing Year
- E04B Class
- 1179 Applications Filed
- 842 Patents Issued To-Date
- 71.42 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- E04B Class
- 0 % this patent is cited more than
- 8 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Jun 12, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jun 12, 2029 |
