US3331332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston pump for conveying concrete or other masses of similar consistency
Assignee: Individual
•
Filing: 1964-12-15
•
Granted: 1967-07-18
•
Expires: 1984-12-15
Abstract
No abstract record available.
Inventors
- 👤 Wennberg Olov Carl Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:12
CPC Classifications
F; F04; F04B; F04B15/00; F04B15/02; F04B15/023; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PISTON PUMP FOR CONCRETE AND THE LIKE, COMPRISING PLURAL FEEDING PISTONS, A DISCHARGE DUCT COMMON TO SAID PISTONS, SAID PISTONS BEING ADAPTED ALTERNATELY TO FORCE THE PUMPED MATERIAL TO SAID COMMON DISCHARGE DUCT, A VALVE DEVICE HAVING A THROUGH PASSAGE AND ADAPTED TO CONTROL THE FLOW OF MATERIAL INTO AN INLET OF SAID DISCHARGE DUCT, SAID INLET BEING COMMON TO BOTH PISTONS AND HAVING A TOTAL INLET AREA AT LEAST TWICE THE CROSS-SECTIONAL AREA OF SAID THROUGH PASSAGE.
Claim 2
Dependent Claim
79 words
A PISTON PUMP FOR CONCRETE AND THE LIKE, COMPRISING PLURAL FEEDING PISTONS, A DISCHARGE DUCT COMMON TO SAID PISTONS, SAID PISTONS BEING ADAPTED ALTERNATELY TO FORCE THE PUMPED MATERIAL TO SAID COMMON DISCHARGE DUCT, A VALVE DEVICE HAVING A THROUGH PASSAGE AND ADAPTED TO CONTROL THE FLOW OF MATERIAL INTO AN INLET OF SAID DISCHARGE DUCT, SAID INLET BEING COMMON TO BOTH PISTONS AND HAVING A TOTAL INLET AREA AT LEAST TWICE THE CROSS-SECTIONAL AREA OF SAID THROUGH PASSAGE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |