Patent US3146680A successfully refreshed from Google Patents.
US3146680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically controlled air cylinder
Assignee: K and H Equipment Ltd
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Filing: 1961-02-13
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Granted: 1964-09-01
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Expires: 1981-02-13
Abstract
No abstract record available.
Inventors
- 👤 James F Hutter
- 👤 Kelly Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:35
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/076; F15B2211/00; F15B2211/20; F15B2211/21; F15B2211/216; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30565; F15B2211/32; F15B2211/327; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/40576; F15B2211/40584; F15B2211/415; F15B2211/41527; F15B2211/41536; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/428; F15B2211/60; F15B2211/625; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7055; F15B2211/72; F15B2211/75; F15B2211/80; F15B2211/885; F15B2211/8855
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A HYDRAULICALLY CONTROLLED AIR CYLINDER STRUCTURE COMPRISING A MAIN AIR CYLINDER HAVING A ROD END COVER AT ONE END THEREOF AND A BLIND END COVER AT THE OTHER END THEREOF, AN AIR PISTON RECIPROCALLY MOUNTED IN SAID AIR CYLINDER, A TUBULAR AIR PISTON ROD EXTENDING THROUGH SAID ROD END COVER AND HAVING A FORWARD END DISPOSED EXTERIORLY THEREOF AND A REAR END FIXED TO SAID AIR PISTON, SAID PISTON ROD HAVING ALTERNATE EXTENSION AND RETRACTION STROKES IN RESPONSE TO AIR PRESSURE ON SAID PISTON, AND HYDRAULIC MEANS FOR CONTROLLING AND ADJUSTING THE SPEED OF SAID STROKES COMPRISING A HYDRAULIC PISTON IN SAID PISTON ROD AND HAVING A FIXED POSITION RELATIVE TO SAID AIR CYLINDER, SAID PISTON ROD HAVING THEREIN A FORWARD OIL CHAMBER AND A REAR OIL CHAMBER, AN OIL RESERVOIR IN SAID AIR CYLINDER IN COMMUNICATION WITH SAID CHAMBERS, THE CAPACITY OF SAID CHAMBERS BEING RESPONSIVE TO MOVEMENT OF SAID PISTON ROD RELATIVE TO SAID HYDRAULIC PISTON, VALVE MEANS CONTROLLING OIL FLOW BETWEEN SAID CHAMBERS THROUGH SAID RESERVOIR, AND A FLOATING RESERVOIR COVER IN SAID AIR CYLINDER VARIABLY CONTROLLING THE CAPACITY THEREOF.
Claim 2
Dependent Claim
183 words
A HYDRAULICALLY CONTROLLED AIR CYLINDER STRUCTURE COMPRISING A MAIN AIR CYLINDER HAVING A ROD END COVER AT ONE END THEREOF AND A BLIND END COVER AT THE OTHER END THEREOF, AN AIR PISTON RECIPROCALLY MOUNTED IN SAID AIR CYLINDER, A TUBULAR AIR PISTON ROD EXTENDING THROUGH SAID ROD END COVER AND HAVING A FORWARD END DISPOSED EXTERIORLY THEREOF AND A REAR END FIXED TO SAID AIR PISTON, SAID PISTON ROD HAVING ALTERNATE EXTENSION AND RETRACTION STROKES IN RESPONSE TO AIR PRESSURE ON SAID PISTON, AND HYDRAULIC MEANS FOR CONTROLLING AND ADJUSTING THE SPEED OF SAID STROKES COMPRISING A HYDRAULIC PISTON IN SAID PISTON ROD AND HAVING A FIXED POSITION RELATIVE TO SAID AIR CYLINDER, SAID PISTON ROD HAVING THEREIN A FORWARD OIL CHAMBER AND A REAR OIL CHAMBER, AN OIL RESERVOIR IN SAID AIR CYLINDER IN COMMUNICATION WITH SAID CHAMBERS, THE CAPACITY OF SAID CHAMBERS BEING RESPONSIVE TO MOVEMENT OF SAID PISTON ROD RELATIVE TO SAID HYDRAULIC PISTON, VALVE MEANS CONTROLLING OIL FLOW BETWEEN SAID CHAMBERS THROUGH SAID RESERVOIR, AND A FLOATING RESERVOIR COVER IN SAID AIR CYLINDER VARIABLY CONTROLLING THE CAPACITY THEREOF.
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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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |