Patent US4923609A successfully refreshed from Google Patents.
US4923609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for purifying liquids employing a particulate filter and a membrane
Assignee: BIO Inc 615 NORTH NEVADA AVENUE COLORADO SPRINGS COLORADO 80903 A CO CORP
•
Filing: 1988-05-20
•
Granted: 1990-05-08
•
Expires: 2008-05-20
Abstract
Abstract A method and apparatus of purifying contaminated liquids employing a particulate filter and a membrane in combination. The particulate filter and membrane are disposed in a unitary container with the membrane being located downstream of the particulate filter. During the process of purifying a contaminated liquid, the membrane causes a back pressure to be exerted on the particulate filter thereby providing substantially even flow of liquid through the particulate filter and minimizing problems associated with uneven flow such as channeling, piping, purging and tunneling. An improved method for cleaning the liquid purification apparatus is also disclosed. The cleaning method preferably employs a gas such as air for scouring the particulate filter and the membrane in a single operation.
Inventors
- 👤 Douglas M. Jardine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:17
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; B01D24/00; B01D24/002; B01D24/02; B01D24/10; B01D24/16; B01D24/167; B01D24/38; B01D24/40; B01D24/46; B01D24/4605; B01D24/4621; B01D36/00; B01D36/02; B01D61/14; B01D61/145; B01D61/16; B01D65/00; B01D65/02; B01D2321/00; B01D2321/16; B01D2321/167; B01D2321/18; B01D2321/185
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
65 words
An apparatus for removing contaminants from a liquid, said apparatus comprising: (a) a container; (b) a particulate filter having an exposed surface disposed in said container; and (c) a membrane having an inlet side and an outlet side disposed downstream of said particulate filter such that back pressure resulting from forcing liquid through said membrane is exerted against said exposed surface of said particulate filter.
Claim 2
Independent Claim
65 words
An apparatus for removing contaminants from a liquid, said apparatus comprising: (a) a container; (b) a particulate filter having an exposed surface disposed in said container; and (c) a membrane having an inlet side and an outlet side disposed downstream of said particulate filter such that back pressure resulting from forcing liquid through said membrane is exerted against said exposed surface of said particulate filter.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said membrane comprises a reverse osmosis membrane.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein said membrane comprises an ultrafiltration membrane.
Claim 5
Independent Claim
14 words
The apparatus of claim wherein said particulate filter comprises a plurality of particulate materials.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4 wherein said plurality of particulate materials are arranged substantially in individual layers.
Claim 7
Dependent Claim
28 words
The apparatus of claim 1 wherein said particulate filter comprises one or more of the materials selected from the group consisting of anthracite, quartz sand, and filter rock.
Claim 8
Dependent Claim
69 words
The apparatus of claim 1 wherein said particulate filter comprises materials selected from the group consisting of anthracite having an average diameter of about 1 to about 4 millimeters, quartz sand having an average diameter of about 1 to about 4 millimeters, quartz sand having an average diameter of about 15 to about 35 millimeters, and filter rock having an average diameter of about 30 to about 65 millimeters.
Claim 9
Dependent Claim
27 words
The apparatus of claim 1 further comprising at least one inlet means for introducing contaminated liquid from outside said container to a location within said particulate filter.
Claim 10
Dependent Claim
23 words
The apparatus of claim 1 further comprising a plurality of inlet means for providing contaminated liquid to a location within said particulate filter.
Claim 11
Dependent Claim
21 words
The apparatus of claim 9 further comprising header means connecting said inlet means and providing fluid communication between said inlet means.
Claim 12
Dependent Claim
21 words
The apparatus of claim 1 further comprising at least one outlet means located downstream of said outlet side of said membrane.
Claim 13
Dependent Claim
24 words
The apparatus of claim 1 further comprising outlet means located downstream of said particulate filter and upstream of said inlet side of said membrane.
Claim 14
Dependent Claim
16 words
The apparatus of claim 1 wherein said container comprises a cylindrical container closed at both ends.
Claim 15
Dependent Claim
16 words
The apparatus of claim 1 wherein said container comprises a top portion and a bottom portion.
Claim 16
Dependent Claim
25 words
The apparatus of claim 14 wherein said particulate filter is disposed in said bottom portion and wherein said membrane is disposed in said top portion.
Claim 17
Dependent Claim
34 words
The apparatus of claim 14 further comprising inlet means for providing contaminated liquid initially located outside of said container to a location within said bottom portion of said container and within said particulate filter.
Claim 18
Dependent Claim
26 words
The apparatus of claim 14 further comprising first outlet means located downstream of said membrane and further located substantially at the uppermost portion of said container.
Claim 19
Dependent Claim
21 words
The apparatus of claim 14 further comprising second outlet means located downstream of said particulate filter and upstream of said membrane.
Claim 20
Dependent Claim
70 words
The apparatus of claim 18 wherein said second outlet means comprises a trough having a longitudinal axis disposed in the upper portion of said container so that said longitudinal axis of said trough is parallel to the longitudinal axis of said container and wherein the interior of said trough substantially faces said inlet side of said membrane and wherein the lower exterior portion of said trough faces said particulate filter.
Claim 21
Independent Claim
23 words
The apparatus of claim further comprising first gas inlet means for introducing gas into the interior of said container within said particulate filter.
Claim 22
Dependent Claim
26 words
The apparatus of claim 14 further comprising first gas inlet means located within the bottom portion of said container for introducing gas within said particulate filter.
Claim 23
Dependent Claim
18 words
The apparatus of claim 1 further comprising second gas inlet means for introducing gas downstream of said membrane.
Claim 24
Dependent Claim
25 words
The apparatus of claim 1 further comprising an opening located in a wall of said container for accessing and servicing the interior of said container.
Claim 25
Independent Claim
12 words
The apparatus of claim further comprising support means for supporting said membrane.
Claim 26
Dependent Claim
18 words
The apparatus of claim 24 wherein said support means are attached to an interior sidewall of said container.
Claim 27
Dependent Claim
26 words
The apparatus of claim 1 wherein said membrane is located a distance from said particulate filter in order to allow for expansion of said particulate filter.
Claim 28
Dependent Claim
27 words
The apparatus of claim 26 wherein said membrane is located a distance from said particulate filter sufficient to allow for about 30% expansion of said particulate filter.
Claim 29
Independent Claim
179 words
An apparatus for removing contaminants from a liquid, said apparatus comprising: (a) a container having a bottom portion and a top portion, inlet means for introducing liquid from the outside of said container to the inside, header means for providing fluid communication between said inlet means, and a first outlet means; (b) a particulate filter disposed in said bottom portion of said container, said particulate filter comprising layers of at least two different particulate filter materials; (c) a reverse osmosis membrane supported in the upper portion of said container and located a sufficient distance from said particulate filter to provide for expansion of said particulate filter; (d) a first gas inlet means for introducing gas within said particulate filter material in said bottom portion of said container; (e) a second gas inlet means for introducing gas downstream of said membrane; (f) a second outlet means comprising a trough located downstream of said particulate filter and upstream of said membrane wherein said open interior portion of said trough faces said membrane and said closed exterior portion faces said particulate filter.
Claim 30
Independent Claim
179 words
An apparatus for removing contaminants from a liquid, said apparatus comprising: (a) a container having a bottom portion and a top portion, inlet means for introducing liquid from the outside of said container to the inside, header means for providing fluid communication between said inlet means, and a first outlet means; (b) a particulate filter disposed in said bottom portion of said container, said particulate filter comprising layers of at least two different particulate filter materials; (c) a reverse osmosis membrane supported in the upper portion of said container and located a sufficient distance from said particulate filter to provide for expansion of said particulate filter; (d) a first gas inlet means for introducing gas within said particulate filter material in said bottom portion of said container; (e) a second gas inlet means for introducing gas downstream of said membrane; (f) a second outlet means comprising a trough located downstream of said particulate filter and upstream of said membrane wherein said open interior portion of said trough faces said membrane and said closed exterior portion faces said particulate filter.
Claim 31
Independent Claim
54 words
A method for purifying contaminated liquids, said method comprising: (a) passing a liquid through a particulate filter having an exposed surface; (b) passing said liquid through a membrane under pressure thereby resulting in the creation of back pressure forces; and (c) subjecting said exposed surface of said particulate filter to said back pressure forces.
Claim 32
Independent Claim
54 words
A method for purifying contaminated liquids, said method comprising: (a) passing a liquid through a particulate filter having an exposed surface; (b) passing said liquid through a membrane under pressure thereby resulting in the creation of back pressure forces; and (c) subjecting said exposed surface of said particulate filter to said back pressure forces.
Claim 33
Dependent Claim
13 words
The method of claim 29 wherein said membrane is a reverse osmosis membrane.
Claim 34
Dependent Claim
12 words
The method of claim 29 wherein said membrane is an ultrafiltration membrane.
Claim 35
Dependent Claim
30 words
The method of claim 29 wherein said liquid is passed through said membrane under pressures within the range of from about 30 to about 2000 pounds per square inch, gauge.
Claim 36
Dependent Claim
27 words
The method of claim 29 wherein said liquid is passed through said membrane under pressures ranging from about 30 to about 150 pounds per square inch, gauge.
Claim 37
Dependent Claim
18 words
The method of claim 29 wherein said contaminated liquid is introduced to a location within said particulate filter.
Claim 38
Dependent Claim
18 words
The method of claim 29 further comprising the step of withdrawing liquid which has passed through said membrane.
Claim 39
Independent Claim
124 words
A method for cleaning an apparatus for purifying liquids comprising a particulate filter and a membrane, said method comprising: (a) introducing a cleaning liquid within a particulate filter having an exposed surface under a pressure sufficient to pass said cleaning liquid through said particulate filter but not through said membrane, wherein said particulate filter and said membrane are positioned within a single container; (b) causing said cleaning liquid to circulate through said particulate filter and around an inlet side of said membrane, said inlet side of said membrane facing said exposed surface of said particulate filter; and (c) removing said cleaning liquid from an area of said container located between said inlet side of said membrane and said exposed surface of said particulate filter.
Claim 40
Independent Claim
124 words
A method for cleaning an apparatus for purifying liquids comprising a particulate filter and a membrane, said method comprising: (a) introducing a cleaning liquid within a particulate filter having an exposed surface under a pressure sufficient to pass said cleaning liquid through said particulate filter but not through said membrane, wherein said particulate filter and said membrane are positioned within a single container; (b) causing said cleaning liquid to circulate through said particulate filter and around an inlet side of said membrane, said inlet side of said membrane facing said exposed surface of said particulate filter; and (c) removing said cleaning liquid from an area of said container located between said inlet side of said membrane and said exposed surface of said particulate filter.
Claim 41
Dependent Claim
36 words
The method of claim 36 further comprising the step of introducing a gas within said particulate filter wherein said gas passes through said particulate filter and said gas impinges upon said inlet side of said membrane.
Claim 42
Dependent Claim
38 words
The method of claim 36 further comprising the step of introducing a gas downstream of said membrane under pressure sufficient to pass said gas from the outlet side of said membrane to the inlet side of said membrane.
Claim 43
Dependent Claim
22 words
The method of claim 38 wherein said gas is selected from the group consisting of argon, carbon dioxide, air and mixtures thereof.
Claim 44
Dependent Claim
10 words
The method of claim 38 wherein said gas comprises air.
Claim 45
Dependent Claim
11 words
The method of claim 36 wherein said cleaning liquid comprises water.
Claim 46
Independent Claim
81 words
A method for purifying a contaminated liquid, comprising: (a) passing said contaminated liquid through a particulate filter for removal of contaminants and yielding a first filtrate; (b) passing said first filtrate through an inlet side of a reverse osmosis membrane, controlling the flow of filtrate through said membrane to provide back pressure against said particulate filter resulting in uniform flow of said contaminated liquid through said particulate filter; and (c) recovering a second filtrate from an outlet side of said membrane.
Claim 47
Independent Claim
81 words
A method for purifying a contaminated liquid, comprising: (a) passing said contaminated liquid through a particulate filter for removal of contaminants and yielding a first filtrate; (b) passing said first filtrate through an inlet side of a reverse osmosis membrane, controlling the flow of filtrate through said membrane to provide back pressure against said particulate filter resulting in uniform flow of said contaminated liquid through said particulate filter; and (c) recovering a second filtrate from an outlet side of said membrane.
Claim 48
Dependent Claim
24 words
A method according to claim 42 further comprising intermittantly passing a cleaning fluid containing gas through said particulate filter for scouring said particulate filter.
Claim 49
Dependent Claim
24 words
A method according to claim 42 in which the gas is selected from the group consisting of argon, carbon dioxide, air and mixtures thereof.
Claim 50
Dependent Claim
25 words
A method according to claim 42 further comprising introducing a gas downstream of said reverse osmosis membrane for dislodging contaminants in said reverse osmosis membrane.
Claim 51
Independent Claim
94 words
An apparatus for purifying a contaminated liquid comprising: a container with a bottom section and a top section; a particulate filter located in said bottom section of said container for removal of contaminants; a reverse osmosis membrane with an inlet side and an outlet side located in said top section of said container for further removal of contaminants, and wherein said reverse osmosis membrane is located downstream of said particulate filter and positioned to provide back pressure against said particulate filter resulting in substantially uniform flow of said contaminated liquid through said particulate filter.
Claim 52
Independent Claim
94 words
An apparatus for purifying a contaminated liquid comprising: a container with a bottom section and a top section; a particulate filter located in said bottom section of said container for removal of contaminants; a reverse osmosis membrane with an inlet side and an outlet side located in said top section of said container for further removal of contaminants, and wherein said reverse osmosis membrane is located downstream of said particulate filter and positioned to provide back pressure against said particulate filter resulting in substantially uniform flow of said contaminated liquid through said particulate filter.
Claim 53
Dependent Claim
27 words
The apparatus of claim 46 further comprising a first means for distributing a gas into a cleaning fluid for passing through said particulate filter during cleaning cycles.
Claim 54
Dependent Claim
40 words
The apparatus of claim 46 further comprising a second means for distributing a gas for agitating fluid in and dislodging contaminants in said reverse osmosis membrane, and causing foaming to occur along the inlet side of said reverse osmosis membrane.
Claim 55
Independent Claim
178 words
An apparatus for purifying water comprising: a container with a bottom section and a top section, a means for water inlet and a means for purified water outlet; a particulate filter located in said bottom section of said container for removal of contaminants from said water; a water distribution means located in the bottom section of said container to receive water from said means for water inlet and distribute said water underneath said particulate filter; a first means for gas distribution for introduction of gas during cleaning cycles located below said water distribution means; a reverse osmosis membrane with an inlet side and an outlet side located in the top section of said container for further removal of contaminants from said water, to provide back pressure against said particulate filter resulting in uniform flow of said water through said particulate filter; a second means for gas distribution located above said reverse osmosis membrane for dislodging contaminants in said reverse osmosis membrane and causing foaming to occur along said inlet side of said reverse osmosis membrane during cleaning cycles.
Claim 56
Independent Claim
178 words
An apparatus for purifying water comprising: a container with a bottom section and a top section, a means for water inlet and a means for purified water outlet; a particulate filter located in said bottom section of said container for removal of contaminants from said water; a water distribution means located in the bottom section of said container to receive water from said means for water inlet and distribute said water underneath said particulate filter; a first means for gas distribution for introduction of gas during cleaning cycles located below said water distribution means; a reverse osmosis membrane with an inlet side and an outlet side located in the top section of said container for further removal of contaminants from said water, to provide back pressure against said particulate filter resulting in uniform flow of said water through said particulate filter; a second means for gas distribution located above said reverse osmosis membrane for dislodging contaminants in said reverse osmosis membrane and causing foaming to occur along said inlet side of said reverse osmosis membrane during cleaning cycles.
References Cited (Backward Citations)
US3436260A
Cited
US3498909A
Cited
US3505215A
Cited
US3836458A
Cited
US3827976A
Cited
US3912624A
Cited
US4198293A
Cited
US4169789A
Cited
US4366063A
Cited
US4636307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |