US3552408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste lift system
Assignee: FRANKLIN W DOWDICAN
•
Filing: 1968-02-01
•
Granted: 1971-01-05
•
Expires: 1988-02-01
Abstract
Abstract A container is connected to a source of waste. Two pumps are mounted in separate compartments within the container and supplied from the source in parallel. The pumps are connected together to discharge waste through a common outlet.
Inventors
- 👤 Franklin W Dowdican
- 👤 Harry R Aschan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:43
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/22; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/8593; Y10T137/877
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A lift system, including: a container; a partition mounted in the container to divide the container into a plurality of compartments which communicate with each other above the partition; an inlet system connected into the container above the partition for introducing waste into the container and dividing the waste over the upper edge of the partition into the compartments in predetermined proportions; a pump unit connected to each compartment with its inlet arranged below the height at which the compartments communicate; and means for actuating each pump unit when the level of waste in the pump compartment is at and above a predetermined height, below the height at which communication takes place between compartments, whereby inoperation of any one pump will cause the level of waste to rise to the predetermined height of communication and pass the waste to a compartment whose pump is operable for discharge of the waste to a point of disposal outside the container.
Claim 2
Dependent Claim
158 words
A lift system, including: a container; a partition mounted in the container to divide the container into a plurality of compartments which communicate with each other above the partition; an inlet system connected into the container above the partition for introducing waste into the container and dividing the waste over the upper edge of the partition into the compartments in predetermined proportions; a pump unit connected to each compartment with its inlet arranged below the height at which the compartments communicate; and means for actuating each pump unit when the level of waste in the pump compartment is at and above a predetermined height, below the height at which communication takes place between compartments, whereby inoperation of any one pump will cause the level of waste to rise to the predetermined height of communication and pass the waste to a compartment whose pump is operable for discharge of the waste to a point of disposal outside the container.
Claim 3
Dependent Claim
83 words
The lift system of claim 1, including: an output manifold connected to all the pumps of the container compartments; and a means connected to each pump discharge to direct a portion of the pumped waste in a sweeping action across the pump inlet; whereby at least partial inoperativeness of any one pump will result in at least part of the output of an operative pump to the output manifold to be directed in a sweeping action across the inlet of the inoperative pump.
Claim 4
Independent Claim
112 words
A method of pumping waste material from a low location to a higher location, including: dividing the waste into portions of predetermined size; collecting each of the predetermined portions so the height of each portion can vary between two levels for each portion; normally pumping waste from each collected portion to a higher location to cycle the height of each portion between the two levels for the portion; and passing waste from a first of the collected portions to a second of the collected portions when the pumping rate from the first portion becomes too low to maintain the height of the first portion between the two levels for the first portion.
Claim 5
Independent Claim
112 words
A method of pumping waste material from a low location to a higher location, including: dividing the waste into portions of predetermined size; collecting each of the predetermined portions so the height of each portion can vary between two levels for each portion; normally pumping waste from each collected portion to a higher location to cycle the height of each portion between the two levels for the portion; and passing waste from a first of the collected portions to a second of the collected portions when the pumping rate from the first portion becomes too low to maintain the height of the first portion between the two levels for the first portion.
Claim 6
Dependent Claim
54 words
The method of claim 3, including directing a part of the waste of the second of the collected portions over the entrance to the pumping unit for the first of the collected portions in a sweeping action to promote cleaning the entrance of any solid material which has at least partially blocked the entrance.
References Cited (Backward Citations)
US933484A
Cited
US1224671A
Cited
US2975983A
Cited
US3112760A
Cited
US3247864A
Cited
US3423766A
Cited
US3404697A
Cited
US3376897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |