US3285142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston type cryogenic apparatus
Assignee: Individual
•
Filing: 1964-04-06
•
Granted: 1966-11-15
•
Expires: 1984-04-06
Abstract
No abstract record available.
Inventors
- 👤 Doll Robert
- 👤 Eder Franz Xaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:54
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A MACHINE WHICH INCLUDES A PISTON RECIPROCATING IN A CYLINDER, AND IN WHICH A GAS UNDER HIGH PRESSURE FLOWS THROUGH THE CLEARANCE SPACE BETWEEN THE PISTON AND THE INNER SURFACE OF THE CYLINDER; MEANS FOR EFFECTING A SELFCENTERING ACTION OF THE PISTON TO MAINTAIN THE SAME CONCENTRIC WITH THE CYLINDER WITHOUT CONTACT WITH THE CYLINDER WALLS DURING RECIPROCATION, COMPRISING A PLURALITY OF ANNULAR GROOVES FORMED IN ONE OF THE PISTON AND CYLINDER SURFACES, AXIALLY SPACED ALONG THE LENGTH THEREOF, THE INTERVENING CLEARANCE SPACE DEFINED BY THE PISTON AND CYLINDER SURFACES BETWEEN ADJACENT GROOVES VARYING AXIALLY IN RADIAL DIMENSION.
Claim 2
Dependent Claim
99 words
IN A MACHINE WHICH INCLUDES A PISTON RECIPROCATING IN A CYLINDER, AND IN WHICH A GAS UNDER HIGH PRESSURE FLOWS THROUGH THE CLEARANCE SPACE BETWEEN THE PISTON AND THE INNER SURFACE OF THE CYLINDER; MEANS FOR EFFECTING A SELFCENTERING ACTION OF THE PISTON TO MAINTAIN THE SAME CONCENTRIC WITH THE CYLINDER WITHOUT CONTACT WITH THE CYLINDER WALLS DURING RECIPROCATION, COMPRISING A PLURALITY OF ANNULAR GROOVES FORMED IN ONE OF THE PISTON AND CYLINDER SURFACES, AXIALLY SPACED ALONG THE LENGTH THEREOF, THE INTERVENING CLEARANCE SPACE DEFINED BY THE PISTON AND CYLINDER SURFACES BETWEEN ADJACENT GROOVES VARYING AXIALLY IN RADIAL DIMENSION.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |