Yieldable prop with yieldable insert
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 12, 2018
Issued Date -
N/A
app pub date -
Sep 8, 2014
filing date -
Nov 22, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
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Abstract
A mine prop includes a first pipe having a first end and a second end, a second pipe having a first end and a second end, and a yield member secured to the second pipe. The second pipe is slidably received in the first pipe. The yield member is configured to yield before the first and second pipes when the mine prop is placed under a predetermined load.
First Claim
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International Classification(s)
- 2014 Application Filing Year
- E21D Class
- 67 Applications Filed
- 60 Patents Issued To-Date
- 89.56 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- E21D Class
- 0 % this patent is cited more than
- 7 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 | Dec 12, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 12, 2029 |
