US3149541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically controlled air leg structure
Assignee: K and H Equipment Ltd
•
Filing: 1963-07-12
•
Granted: 1964-09-22
•
Expires: 1983-07-12
Abstract
No abstract record available.
Inventors
- 👤 James F Hutter
- 👤 Kelly Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:18
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A HYDRAULICALLY CONTROLLED AIR LEG COMPRISING A MAIN CYLINDER BARREL, AN AIR PISTON ROD EXTENDING AXIALLY INTO SAID BARREL AND HAVING REAR AND FORWARD HYDRAULIC FLUID CHAMBERS THEREIN, AN AIR PISTON FIXED TO SAID PISTON ROD IN SAID BARREL, A HYDRAULIC PISTON ROD AXIALLY ARRANGED IN SAID BARREL AND FIXEDLY CONNECTED THERETO, SAID HYDRAULIC PISTON ROD EXTENDING THROUGH SAID AIR PISTON, A FLOATING COVER IN SAID AIR PISTON ROD DEFINING ONE END OF SAID FORWARD HYDRAULIC FLUID CHAMBER, A HYDRAULIC PISTON ON SAID HYDRAULIC PISTON ROD, SAID HYDRAULIC FLUID CHAMBERS, AND MEANS PROVIDING AN OIL FLOW PASSAGE THROUGH SAID HYDRAULIC PISTON FROM ONE OF SAID CHAMBERS TO THE OTHER.
Claim 2
Dependent Claim
109 words
A HYDRAULICALLY CONTROLLED AIR LEG COMPRISING A MAIN CYLINDER BARREL, AN AIR PISTON ROD EXTENDING AXIALLY INTO SAID BARREL AND HAVING REAR AND FORWARD HYDRAULIC FLUID CHAMBERS THEREIN, AN AIR PISTON FIXED TO SAID PISTON ROD IN SAID BARREL, A HYDRAULIC PISTON ROD AXIALLY ARRANGED IN SAID BARREL AND FIXEDLY CONNECTED THERETO, SAID HYDRAULIC PISTON ROD EXTENDING THROUGH SAID AIR PISTON, A FLOATING COVER IN SAID AIR PISTON ROD DEFINING ONE END OF SAID FORWARD HYDRAULIC FLUID CHAMBER, A HYDRAULIC PISTON ON SAID HYDRAULIC PISTON ROD, SAID HYDRAULIC FLUID CHAMBERS, AND MEANS PROVIDING AN OIL FLOW PASSAGE THROUGH SAID HYDRAULIC PISTON FROM ONE OF SAID CHAMBERS TO THE OTHER.
References Cited (Backward Citations)
US2078364A
Cited
US2132519A
Cited
US2193736A
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US2564790A
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US2679827A
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US2813515A
Cited
US3055343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |