US3617551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for purifying oil-contaminated water
Assignee: Standard Oil Co
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Filing: 1970-03-18
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Granted: 1971-11-02
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Expires: 1990-03-18
Abstract
Abstract Disclosed is a ''''cartridge-type'''' apparatus useful for purifying oil-contaminated water. This apparatus includes a flow-through chamber containing polyurethane foam and a pistonlike member which responds to hydraulic pressure to squeeze the foam. As oilcontaminated water flows through the chamber, oil is absorbed by the foam. Periodically, a hydraulic pressure head is established within the chamber which forces the pistonlike member to compress the foam and squeeze the oil therefrom.
Inventors
- 👤 Walker F Johnston
- 👤 Robert G Will
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:53
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; C; C10; C10G; C10G33/00; C10G33/06; B01D29/00; B01D29/62; B01D29/70; B01D29/705
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A process for purifying oil-contaminated water, comprising the steps of: passing said water in a first direction through a regenerable, porous filter material which selectively absorbs oil, said filter material being contained within a chamber having a first and second spaced port means, withdrawing the water flowing through the filter material at the first port means, periodically establishing a hydraulic pressure within the chamber means by passing water into the chamber means which flows generally in a direction opposite to said first direction, said hydraulic pressure squeezing absorbed oil from the filter material, and withdrawing from the chamber means oil squeezed from the filter material at the second port means.
Claim 2
Dependent Claim
12 words
The process of claim 2 wherein the filter material is polyurethane foam.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |