Closure cover and extension ladder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 2, 2021
Grant Date -
N/A
app pub date -
Jul 3, 2017
filing date -
Apr 20, 2017
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A closure cover and an extension ladder are provided. The closure cover includes an upper closure plate, a lower closure plate, and two airtight sheets, the upper closure plate and the lower closure plate are fixedly connected by a connector, the upper closure plate and the lower closure plate are each provided with ventilation holes, the airtight sheets are fixed to a surface of the upper closure plate facing away from the lower closure plate and a surface of the lower closure plate facing away from the upper closure plate, respectively, and the airtight sheets are capable of controlling the closing and opening of the ventilation holes.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2017 Application Filing Year
- E06C Class
- 164 Applications Filed
- 113 Patents Issued To-Date
- 68.91 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- E06C Class
- 83.61 % this patent is cited more than
- 4 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 | Sep 2, 2028 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 2, 2032 |