Delay return gas spring
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 23, 2013
Grant Date -
Sep 16, 2010
app pub date -
Mar 10, 2009
filing date -
Mar 10, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A delay return gas spring including a piston at least partially received in a cylinder for reciprocation between extended and compressed positions over a cycle including a compression stroke and a return stroke. A seal disposed between the cylinder and the piston separates a primary chamber on one side of the seal from a secondary chamber on another side of the seal during a portion of the cycle. A passage communicates with the secondary chamber and with the primary chamber. The seal is relatively movable between an open position permitting free flow of gas through the passage to a closed position at least partially restricting gas flow through the passage so as to permit gas in the secondary chamber to be compressed in response to movement of the piston toward its extended position, thereby reducing a net return force on the piston and decreasing a velocity of the piston.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2009 Application Filing Year
- F16F Class
- 365 Applications Filed
- 232 Patents Issued To-Date
- 63.57 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 4 Citation Count
- F16F Class
- 6.32 % this patent is cited more than
- 12 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 23, 2025 |
