US3228876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeability separatory apparatus, permeability separatory membrane element, method of making the same and process utilizing the same
Assignee: Dow Chemical Co
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Filing: 1960-09-19
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Granted: 1966-01-11
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Expires: 1980-09-19
Abstract
No abstract record available.
Inventors
- 👤 Henry I Mahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:17
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; A; A23; A23F; A23F5/00; A23F5/24; A23F5/28; B01D63/00; B01D63/02; B01D63/021; B01D63/022; B01D63/0221; B01D63/04; B01D63/043; Y; Y10; Y10S; Y10S128/00; Y10S128/03; Y10S159/00; Y10S159/27; Y10S435/00; Y10S435/803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PERMEABILITY SEPARATORY APPARATUS INCLUDING A PERMEABLE MEMBRANE CELL HAVING POSITIONED THEREIN A MULTIPLICITY OF BUNLES OF CONTINUOUSLY HOLLOW, SELECTIVELY PERMEABLE, FINE FIBERS HAVING TERMINAL PORTIONS, SUPPORTING MEANS FOR EACH OF SAID FIBERS WITHIN EACH SAID BUNCLE
Claim 2
Dependent Claim
37 words
A PERMEABILITY SEPARATORY APPARATUS INCLUDING A PERMEABLE MEMBRANE CELL HAVING POSITIONED THEREIN A MULTIPLICITY OF BUNLES OF CONTINUOUSLY HOLLOW, SELECTIVELY PERMEABLE, FINE FIBERS HAVING TERMINAL PORTIONS, SUPPORTING MEANS FOR EACH OF SAID FIBERS WITHIN EACH SAID BUNCLE
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |