Retractable staircase
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 9, 2022
Grant Date -
May 6, 2021
app pub date -
Jan 8, 2021
filing date -
Aug 11, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A retractable staircase having a first side stringer and a second substantially parallel side stringer connected to a plurality of steps. The first side stringer is fixedly attached to a wall and the second side stringer is pivotally movable about the first side stringer between an extended position, where the steps lie substantially horizontally between the stringers, and a retracted position where the steps lie substantially vertically between the stringers. The retractable staircase also includes a collapsible handrail and a gate that are interconnected with the side stringers and the pivoting steps so that when one of them is moved, the other two move substantially simultaneously.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2021 Application Filing Year
- E04F Class
- 679 Applications Filed
- 329 Patents Issued To-Date
- 48.46 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- E04F Class
- 0 % this patent is cited more than
- 3 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Feb 9, 2026 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Feb 9, 2030 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 9, 2034 |
