US3320901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete pump
Assignee: F W GARTNER CO
•
Filing: 1965-09-15
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Granted: 1967-05-23
•
Expires: 1985-09-15
Abstract
No abstract record available.
Inventors
- 👤 Milton P Koy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:56
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/10; F04B43/113; F04B43/1133; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A PUMP FOR CONCRETE OR SIMILAR MATERIALS COMPRISING AN ELONGATED GENERALLY CYLINDRICAL CASING HAVING AN INLET VALVE AND AN OUTLET VALVE ADJACENT ONE END OF THE CASING, THE OTHER END OF SAID CASING BEING CLOSED AND HAVING A FITTING FOR CONNECTION WITH A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE AND VACUUM SELECTIVELY, A PISTON FREELY MOVABLE IN SAID CYLINDRICAL CASING, AND AN EVERTING FLEXIBLE DIAPHRAGM OF CYLINDRICAL CONSTRUCTION HAVING ONE END SEALED TO THE CASING REMOTE FROM THE CLOSED END THEREOF AND THE OTHER END SEALED TO THE PISTON, SAID PISTON FORCING THE DIAPHRAGM INTO TIGHT SEALING ENGAGEMENT WITH THE INTERIOR OF THE CASING, SAID DIAPHRAGM HAVING AN INTERMEDIATE PORTION BEING FOLDED SO THAT SELECTIVE OPENING OF THE INLET, CLOSING OF THE OUTLET AND EVACUATING THE HYDRAULIC FLUID UNDER PRESSURE WILL CAUSE THE PISTON TO MOVE IN AN INTAKE STROKE AND CLOSING OF THE INTAKE, OPENING OF THE EXHAUST AND ADMITTING HYDRAULIC FLUID UNDER PRESSURE WILL CAUSE THE PISTON TO MOVE TOWARDS THE END OF THE CYLINDER HAVING THE INLETS AND OUTLETS THEREIN FOR FORMING A WORKING STROKE FOR THE PUMP.
Claim 2
Dependent Claim
181 words
A PUMP FOR CONCRETE OR SIMILAR MATERIALS COMPRISING AN ELONGATED GENERALLY CYLINDRICAL CASING HAVING AN INLET VALVE AND AN OUTLET VALVE ADJACENT ONE END OF THE CASING, THE OTHER END OF SAID CASING BEING CLOSED AND HAVING A FITTING FOR CONNECTION WITH A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE AND VACUUM SELECTIVELY, A PISTON FREELY MOVABLE IN SAID CYLINDRICAL CASING, AND AN EVERTING FLEXIBLE DIAPHRAGM OF CYLINDRICAL CONSTRUCTION HAVING ONE END SEALED TO THE CASING REMOTE FROM THE CLOSED END THEREOF AND THE OTHER END SEALED TO THE PISTON, SAID PISTON FORCING THE DIAPHRAGM INTO TIGHT SEALING ENGAGEMENT WITH THE INTERIOR OF THE CASING, SAID DIAPHRAGM HAVING AN INTERMEDIATE PORTION BEING FOLDED SO THAT SELECTIVE OPENING OF THE INLET, CLOSING OF THE OUTLET AND EVACUATING THE HYDRAULIC FLUID UNDER PRESSURE WILL CAUSE THE PISTON TO MOVE IN AN INTAKE STROKE AND CLOSING OF THE INTAKE, OPENING OF THE EXHAUST AND ADMITTING HYDRAULIC FLUID UNDER PRESSURE WILL CAUSE THE PISTON TO MOVE TOWARDS THE END OF THE CYLINDER HAVING THE INLETS AND OUTLETS THEREIN FOR FORMING A WORKING STROKE FOR THE PUMP.
References Cited (Backward Citations)
US3007416A
Cited
US3204858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |