Patent US3797202A successfully refreshed from Google Patents.
US3797202A
Expired / Lapsed
US
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Microporous/non-porous composite membranes
Assignee: General Electric Co
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Filing: 1971-08-27
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Granted: 1974-03-19
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Expires: 1991-08-27
Abstract
Abstract A microporous/non-porous membrane laminate construction is described for incorporation in membrane package construction. One or both sides of the non-porous membrane is covered with a microporous membrane to form a membrane assembly. An exemplary membrane package construction employing the membrane assembly is described.
Inventors
- 👤 C Neulander
- 👤 W Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:21
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0093; B01D; B01D53/00; B01D53/22; B01D63/00; B01D63/08; B01D63/082; B01D63/0822; B01D69/00; B01D69/12; B01D69/1214; B01D71/00; B01D71/06; B01D71/26; B01D71/262; B01D2313/00; B01D2313/04; B01D2313/041; B01D2313/042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The combination of claim 1 wherein the non-porous and microporous membranes are bonded together over part of their contact surface area.
Claim 2
Dependent Claim
14 words
The combination of claim 1 wherein the non-porous membrane is an immobilized liquid membrane.
Claim 3
Dependent Claim
13 words
The combination of claim 1 wherein the microporous membrane is made of polypropylene.
Claim 4
Dependent Claim
18 words
The combination of claim 1 wherein one microporous membrane is disposed on each side of the non-porous membrane.
References Cited (Backward Citations)
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Cited
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US3416985A
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US3447286A
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US3567810A
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US3615024A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |