Patent US3920736A successfully refreshed from Google Patents.
US4769263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supported membrane
Assignee: Shell USA Inc
•
Filing: 1986-09-11
•
Granted: 1988-09-06
•
Expires: 2006-09-11
Abstract
Abstract A supported membrane comprising a non-woven monofiliment support layer wherein dense membranes with a maximum width of 5000 μm are surrounded by filaments. The invention further relates to a process for the preparation of said supported membranes.
Inventors
- 👤 Johan G. A. Bitter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/107; B01D69/1071; B01D69/108; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1355; Y10T428/1362; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/31504; Y10T428/3154; Y10T428/31551; Y10T428/31598; Y10T428/31601; Y10T442/00; Y10T442/10; Y10T442/184; Y10T442/188; Y10T442/191
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A supported membrane comprising a dense hole-free membrane supported on a non-woven monofilament support layer wherein the dense membrane is a polymer selected from the group consisting of polyalkylene, polydimethyl siloxane, polyurethane, and styrene-butadiene-styrene rubber, wherein the dense membrane has a maximum width of about 5000 μm and a thickness less than about 25 μm and the dense membrane is surrounded by the filaments of the support layer.
Claim 2
Dependent Claim
68 words
A supported membrane comprising a dense hole-free membrane supported on a non-woven monofilament support layer wherein the dense membrane is a polymer selected from the group consisting of polyalkylene, polydimethyl siloxane, polyurethane, and styrene-butadiene-styrene rubber, wherein the dense membrane has a maximum width of about 5000 μm and a thickness less than about 25 μm and the dense membrane is surrounded by the filaments of the support layer.
Claim 3
Dependent Claim
19 words
The supported membrane of claim 1 wherein the dense membranes have a width from about 5 to 2000 μm.
Claim 4
Dependent Claim
20 words
The supported membrane of claim 1 wherein the dense membranes have a width from about 5 to about 500 μm.
Claim 5
Dependent Claim
18 words
The supported membrane of claim 3 wherein the dense membranes have a thickness less than about 10 μm.
Claim 6
Dependent Claim
41 words
The supported membrane of claim 1 wherein the non-woven monofilament support layer comprises a mesh selected from the group consisting of a polymeric mesh, a glass fiber mesh, a metallic mesh and any combination of polymeric, glass fiber and metallic mesh.
Claim 7
Dependent Claim
31 words
The supported membrane of claim 5 wherein the non-woven monofilament support layer comprises a mesh selected from the group consisting of a polyester mesh, a steel mesh, and a polytetrafluoroethylene mesh.
Claim 8
Dependent Claim
14 words
The supported membrane of claim 1 wherein the dense membranes comprise a non-porous polyalkylene.
Claim 9
Dependent Claim
14 words
The supported membrane of claim 7 wherein the dense membranes comprise a non-porous polypropylene.
Claim 10
Dependent Claim
29 words
The supported membrane of claim 1 wherein the non-woven monofilament support layer is comprised of a polyester mesh and the dense membranes are comprised of a styrene-butadiene-styrene block copolymer.
Claim 11
Dependent Claim
28 words
The supported membrane of claim 1 wherein the non-woven monofilament support layer is comprised of a polytetrafluoroethylene mesh and the dense membranes are comprised of poly dimethyl siloxane.
Claim 12
Dependent Claim
28 words
The supported membrane of claim 1 wherein the supported membrane is spirally wound such that along both sides of the supported membrane a fluid flow can be maintained.
References Cited (Backward Citations)
US1693890A
Cited
US1720670A
Cited
US2944017A
Cited
US3721596A
Cited
US4685987A
Cited
US4610918A
Cited
US4673613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |