Patent US4925562A successfully refreshed from Google Patents.
US4925562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pervaporation process and membrane
Assignee: GFT GESELLSCHAFT fur TRENNTECHNIK MBH GERBERSTRASSE 48 6650 HOMBURG/SAAR FED REP OF GERMANY
•
Filing: 1987-07-23
•
Granted: 1990-05-15
•
Expires: 2007-07-23
Abstract
Abstract A prevaporation process characterized by excellent separation efficiency employs a membrane that comprises an elastomeric polymer matrix containing zeolite.
Inventors
- 👤 Hendrikus J. D. te Hennepe
- 👤 Marcellinus H. V. Mulder
- 👤 Cornelis A. Smolders
- 👤 Derk Bargeman
- 👤 George A. T. Schroder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:40
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0079; B01D61/00; B01D61/36; B01D61/362; B01D61/3621; B01D69/00; B01D69/14; B01D69/141; B01D69/147; B01D69/148; B01D71/00; B01D71/02; B01D71/028; B01D71/0281; B01D71/06; B01D71/70; B01D71/701
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
A pervaporation membrane for the separation of small molecules from a fluid or a gas, comprising material (a) embedded in a polymer matrix (b) that is comprised of silicone rubber, wherein said material (a) has molecular-sieve properties and comprises zeolite characterized by an Si:A1 atomic ratio of at least 12 or an SiO 2 :A1 2 O 3 ratio of at least 35.
Claim 2
Dependent Claim
63 words
A pervaporation membrane for the separation of small molecules from a fluid or a gas, comprising material (a) embedded in a polymer matrix (b) that is comprised of silicone rubber, wherein said material (a) has molecular-sieve properties and comprises zeolite characterized by an Si:A1 atomic ratio of at least 12 or an SiO 2 :A1 2 O 3 ratio of at least 35.
Claim 3
Dependent Claim
22 words
The membrane of claim 1, wherein said zeolite has an ethanol absorption capacity in the range of about 0.04 to 0.20 g/g.
Claim 4
Dependent Claim
19 words
The membrane of claim 1, wherein said zeolite is present in an amount of at least 10% by weight.
Claim 5
Dependent Claim
22 words
The membrane of claim 3, wherein said zeolite is present in an amount in the range from 10% to 90% by weight.
Claim 6
Dependent Claim
22 words
The membrane of claim 3, wherein said zeolite is present in an amount in the range from 50% to 70% by weight.
Claim 7
Dependent Claim
17 words
The membrane of claim 1, wherein said zeolite has a particle size of less than 40 μm.
Claim 8
Dependent Claim
18 words
The membrane of claim 6, wherein said particle size is in the range from 0.5 to 10 μm.
Claim 9
Dependent Claim
19 words
The membrane of claim 1, wherein said membrane has a thickness in the range from 50 to 500 μm.
Claim 10
Dependent Claim
17 words
The membrane of claim 8, wherein said thickness is in the range from 100 to 200 μm.
Claim 11
Dependent Claim
12 words
The membrane of claim 1, wherein said silicone rubber is a polysiloxane.
Claim 12
Dependent Claim
12 words
The membrane of claim 10, wherein said polysiloxane is a polyhydrocarbyl siloxane.
Claim 13
Dependent Claim
10 words
The membrane of claim 10, wherein said polysiloxane is polydimethylsiloxane.
References Cited (Backward Citations)
US4311594A
Cited
US4737165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |