US3890224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling surface pollutants
Assignee: Commonwealth Scientific and Industrial Research Organisation
•
Filing: 1971-04-29
•
Granted: 1975-06-17
•
Expires: 1991-04-29
Abstract
Abstract A method of phase separation using ferromagnetic materials. A mixture of phases is treated with particles or granules of ferromagnetic material so that one of the phases is preferentially absorbed or collected onto or into the particles or granules. The particles or granules of the ferromagnetic material together with the absorbed or collected phase may then be recovered from the remainder of the mixture using magnetic means.
Inventors
- 👤 Donald Eric Weiss
- 👤 Hendrik Adriaan Jacob Battaerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:48
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0492; B01D17/00; B01D17/02; B01D17/0202; B01D17/04; B01D35/00; B01D35/06; B01D37/00; B01D37/02; B01J; B01J20/00; B01J47/00; B01J47/02; B01J47/06; B01J49/00; B01J49/40; B01J49/45; B03; B03B; B03B1/00; B03B1/04; B03C; B03C1/00; B03C1/005; B03C1/01; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A METHOD OF REMOVING AN OIL SLICK FROM AQUEOUS MEDIA, SAID METHOD COMPRISING: FIRSTLY, TREATING SAID SLICK WITH SUFFICIENT FINE PARTICLES OR GRANULES OF FERROMAGNETIC SYNTHETIC POLYMERIC MATERIAL BEING CHARACTERISED IN THAT SAID FERROMAGNETIC PARTICLES PREFERENTIALLY ABSORB OR ABSORB OIL FROM AQUEOUS MEDIA AND ALSO THE PARTICLES OR GRANULES FLOAT ON THE AQUEOUS MEDIA WHEN ASSOCIATED WITH THE OIL; SECONDLY REMOVING
Claim 2
Independent Claim
61 words
A METHOD OF REMOVING AN OIL SLICK FROM AQUEOUS MEDIA, SAID METHOD COMPRISING: FIRSTLY, TREATING SAID SLICK WITH SUFFICIENT FINE PARTICLES OR GRANULES OF FERROMAGNETIC SYNTHETIC POLYMERIC MATERIAL BEING CHARACTERISED IN THAT SAID FERROMAGNETIC PARTICLES PREFERENTIALLY ABSORB OR ABSORB OIL FROM AQUEOUS MEDIA AND ALSO THE PARTICLES OR GRANULES FLOAT ON THE AQUEOUS MEDIA WHEN ASSOCIATED WITH THE OIL; SECONDLY REMOVING
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein the synthetic ferromagnetic polymer comprises a ferromagnetic particle incorporated wholly or partially within polystyrene or copolymers of styrene and polyesters.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein the synthetic ferromagnetic polymer particles are vesicular or retiporous.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the particles are in the size range from 500 to 5,000 microns overall diameter.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein the aqueous medium is sea water.
Claim 7
Dependent Claim
13 words
A process according to claim 1 wherein the aqueous medium is river water.
Claim 8
Dependent Claim
45 words
A method of removing an oil slick from aqueous media according to claim 1 wherein the separated particles together with the associated oil are subjected to additional stages of recovery of the ferromagnetic particles and subsequently reusing the recovered particles for removal of further oil.
Claim 9
Independent Claim
95 words
A method of controlling surface pollutants on a body of liquid, said method comprising the steps of: a. treating a plurality of low density plastic material particles having an affinity for said pollutants so as to be reactive to a magnetic field, b. dispersing said plurality of particles onto a pre-determined surface of said liquid, c. containing said dispersed particles into a collected mass by subjecting said particles to a magnetic field, and d. positioning said collected mass of particles by locating said magnetic field in a pre-determined position on the surface of said liquid.
Claim 10
Independent Claim
95 words
A method of controlling surface pollutants on a body of liquid, said method comprising the steps of: a. treating a plurality of low density plastic material particles having an affinity for said pollutants so as to be reactive to a magnetic field, b. dispersing said plurality of particles onto a pre-determined surface of said liquid, c. containing said dispersed particles into a collected mass by subjecting said particles to a magnetic field, and d. positioning said collected mass of particles by locating said magnetic field in a pre-determined position on the surface of said liquid.
Claim 11
Dependent Claim
25 words
A method of controlling surface pollutants as in claim 8 wherein treating of said plurality of particles includes coating said particles with a ferromagnetic material.
Claim 12
Dependent Claim
25 words
A process of controlling surface pollutaNts as in claim 8 wherein treating of said plurality of particles includes inserting ferromagnetic material directly into said particles.
Claim 13
Dependent Claim
44 words
A process for controlling surface pollutants as in claim 8 wherein said process further comprises the steps of forming said particles from polystyrene and wherein treating said particles includes inserting ferromagnetic material into said polystyrene particles when said particles are in an unexpanded state.
References Cited (Backward Citations)
US2367384A
Cited
US3358838A
Cited
US3520806A
Cited
US3717573A
Cited
US3767571A
Cited
US3657119A
Cited
US3635819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |