Pneumatic springs
Abstract
Abstract 1. A PNEUMATIC SPRING COMPRISING A CYLINDER HAVING A PRESSURE SEAL AT ITS OUTER END, A PISTION AND A PISTON ROD EXTENDING SLIDINGLY AND SEALINGLY THROUGH THE PRESSURE SEAL, SAID PISTION ROD HAVING NEAR ITS OUTER END A PORTION OF REDUCED CROSS SECTION LESS THAN THE INNER DIAMETER OF SAID SEAL, THE RELATIVE DIMENSIONS OF SAID SEAL AND SAID PORTION OF REDUCED DIAMETER BEING SUCH THAT WHEN SAID PORTION IS ALIGNED WITH SAID SEAL THE SPACE BETWEEN SAID SEAL AND SAID PORTION OF REDUCED CROSS SECTION DEFINES A PASSAGE FOR THE FLOW OF GAS INTO OR OUT OF SAID CYLINDER WITHOUT DEFLECTION OF SAID SEAL, AND A REMOVABLE END FITTING SECURED TO THE OUTER END OF SAID PISTON ROD TO PREVENT INWARD MOVEMENT OF SAID ROD SUFFICIENT FOR SAID REDUCED PORTION TO BE ALIGNED WITH SAID PRESSURE SEAL EXCEPT WHEN SAID FITTING IS REMOVED FROM THE OUTER END OF SAID PISTON ROD.
Inventors
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Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |