Jack for installing mine stopping
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 9, 2022
Grant Date -
Jul 1, 2021
app pub date -
Dec 31, 2019
filing date -
Dec 31, 2019
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2019 Application Filing Year
- E21F Class
- 66 Applications Filed
- 39 Patents Issued To-Date
- 59.10 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- E21F 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 |
