Patent US3862031A successfully refreshed from Google Patents.
US3862031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer membrane type mass transfer device and process
Assignee: Baxter International Inc
•
Filing: 1972-11-24
•
Granted: 1975-01-21
•
Expires: 1992-11-24
Abstract
Abstract A foldable cardboard backing is secured to one surface of a flexible mass transfer membrane to enable rapid formation of a folded multi-layered device by compressing the backing and membrane connected thereto into folds and then fixing the folds by sealing their ends.
Inventors
- 👤 Ronald James Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:13
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A method of securing a semipermeable membrane made of difficultly adhering material to an impermeable backing, which comprises: applying a tape member which is adhesive on both sides longitudinally along a face of said backing; laying said membrane on said tape member with a longitudinal edge of said membrane overlying said tape member; applying a bead of sealant over said tape member and said membrane longitudinal edge; and thereafter folding said backing and membrane along transverse lines of folding to encase and squeeze said bead of sealant between folds of membrane.
Claim 2
Independent Claim
91 words
A method of securing a semipermeable membrane made of difficultly adhering material to an impermeable backing, which comprises: applying a tape member which is adhesive on both sides longitudinally along a face of said backing; laying said membrane on said tape member with a longitudinal edge of said membrane overlying said tape member; applying a bead of sealant over said tape member and said membrane longitudinal edge; and thereafter folding said backing and membrane along transverse lines of folding to encase and squeeze said bead of sealant between folds of membrane.
Claim 3
Dependent Claim
142 words
A MASS TRANSFER DEVICE WHICH COMPRISES A FLEXIBLE SEMIPERMEABLE MEMBRANE FOLDED TO PROVIDE A PLURALITY OF MEMBRANE LAYERS ARRANGED FOR FLOW OF A FLUID IN A PLURALITY OF PARAL LEL FIRST FLOW PATHS FOR FLOW OF ANOTHER FLUID IN A PLURALITY OF PARALLEL SECOND FLOW PATHS POSITIONED BETWEEN AND SEPARATED FROM SAID FIRST FLOW PATHS BY SAID MEMBRANE, AN INTEGRAL BACKING FOLDED AND ARRANGED ON ONE SIDE OF SAID MEMBRANE FOR SUPPORT THEREOF, SAID MEMBRANE BEING ATTACHED TO THE BACKING AT LATERAL EDGES OF SAID MEMBRANE BY A TAPE MEMBER WHICH IS ATTACHED AT OPPOSITE SIDES THEREOF TO THE BACKING AND MEMBRANE RESPECTIVELY, THE SIDES OF SAID FOLDED MEMBRANE LAYERS OPPOSITE TO THE TAPE MEMBER BEING SEALED TOGETHER IN LEAKPROOF MANNER WITH A BEAD OF ELASTOMERIC SEALANT WHICH ALSO OVERLAPS THE LATERAL EDGES OF THE MEMBRANE TO ADHERE TO THE TAPE MEMBER.
Claim 4
Dependent Claim
142 words
A MASS TRANSFER DEVICE WHICH COMPRISES A FLEXIBLE SEMIPERMEABLE MEMBRANE FOLDED TO PROVIDE A PLURALITY OF MEMBRANE LAYERS ARRANGED FOR FLOW OF A FLUID IN A PLURALITY OF PARAL LEL FIRST FLOW PATHS FOR FLOW OF ANOTHER FLUID IN A PLURALITY OF PARALLEL SECOND FLOW PATHS POSITIONED BETWEEN AND SEPARATED FROM SAID FIRST FLOW PATHS BY SAID MEMBRANE, AN INTEGRAL BACKING FOLDED AND ARRANGED ON ONE SIDE OF SAID MEMBRANE FOR SUPPORT THEREOF, SAID MEMBRANE BEING ATTACHED TO THE BACKING AT LATERAL EDGES OF SAID MEMBRANE BY A TAPE MEMBER WHICH IS ATTACHED AT OPPOSITE SIDES THEREOF TO THE BACKING AND MEMBRANE RESPECTIVELY, THE SIDES OF SAID FOLDED MEMBRANE LAYERS OPPOSITE TO THE TAPE MEMBER BEING SEALED TOGETHER IN LEAKPROOF MANNER WITH A BEAD OF ELASTOMERIC SEALANT WHICH ALSO OVERLAPS THE LATERAL EDGES OF THE MEMBRANE TO ADHERE TO THE TAPE MEMBER.
Claim 5
Dependent Claim
13 words
The mass transfer device of claim 2 in which said membrane comprises cellulose.
Claim 6
Dependent Claim
13 words
The mass transfer device of claim 2 in which said membrane comprises polytetrafluoroethylene.
Claim 7
Dependent Claim
21 words
The mass transfer device of claim 2 in which said bead of sealant comprises a silicone rubber room temperature vulcanizing elastomer.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |