US3334549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lineal actuator
Assignee: Individual
•
Filing: 1964-07-24
•
Granted: 1967-08-08
•
Expires: 1984-07-24
Abstract
No abstract record available.
Inventors
- 👤 Arnold C Sheldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:02
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F15B15/1452; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A HYDRAULIC ACTUATOR INCLUDING A PISTON MEMBER SLIDABLY FITTED WITHIN A CYLINDER TO BE MOVED AXIALLY WITHIN THE CYLINDER AS HYDRAULIC FLUID IS INJECTED UNDER PRESSURE INTO THE CYLINDER, SAID PISTON HAVING ANNULAR RECESSES FORMED IN ITS LEADING AND TRAILING PERIPHERAL EDGES RELATIVE TO THE DIRECTION OF MOVEMENT, A PAIR OF ANNULAR SEALS OF POLYURETHANE MATERIAL DISPOSED ONE IN EACH RECESS TO PROVIDE FLUID-TIGHT SEALING ENGAGEMENT BETWEEN THE PISTON AND CYLINDER, THE PERIPHERAL ANNULAR SURFACE OF THE PISTON
Claim 2
Dependent Claim
79 words
IN A HYDRAULIC ACTUATOR INCLUDING A PISTON MEMBER SLIDABLY FITTED WITHIN A CYLINDER TO BE MOVED AXIALLY WITHIN THE CYLINDER AS HYDRAULIC FLUID IS INJECTED UNDER PRESSURE INTO THE CYLINDER, SAID PISTON HAVING ANNULAR RECESSES FORMED IN ITS LEADING AND TRAILING PERIPHERAL EDGES RELATIVE TO THE DIRECTION OF MOVEMENT, A PAIR OF ANNULAR SEALS OF POLYURETHANE MATERIAL DISPOSED ONE IN EACH RECESS TO PROVIDE FLUID-TIGHT SEALING ENGAGEMENT BETWEEN THE PISTON AND CYLINDER, THE PERIPHERAL ANNULAR SURFACE OF THE PISTON
References Cited (Backward Citations)
US1621858A
Cited
US1508264A
Cited
US2615769A
Cited
US2835540A
Cited
US2962330A
Cited
US2982590A
Cited
US3181560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |