US3256997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for separating immiscible liquids
Assignee: Pall Corp
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Filing: 1963-09-30
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Granted: 1966-06-21
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
- 👤 Krakauer Sidney
- 👤 Chesterfield F Seibert
- 👤 Jr Marcel G Verrando
- 👤 Cyril A Keedwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/045; B01D17/08; B01D17/10; Y; Y10; Y10S; Y10S210/00; Y10S210/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A SPIRALLY WOUND ELEMENT OF THE DEPTH TYPE, USEFUL AS D COALESCER AND AS A SEPARATOR, COMPRISING A LAYER OF POROUS WOVEN FABRIC AND AT LEAST ONE LAYER OF UNWOVEN FIBROUS MATERIAL, SPIRALLY WOUND INTO THE FORM OF A TUBE HAVING AN OPEN CENTRAL PASSAGE AND A PLURALITY OF HELICAL LAYERS OF POROUS WOVEN FABRIC AND UNWOVEN FIBROUS MATERIAL, THE FIBROUS MATERIAL LAYERS BEING COMPOSED OF
Claim 2
Dependent Claim
66 words
A SPIRALLY WOUND ELEMENT OF THE DEPTH TYPE, USEFUL AS D COALESCER AND AS A SEPARATOR, COMPRISING A LAYER OF POROUS WOVEN FABRIC AND AT LEAST ONE LAYER OF UNWOVEN FIBROUS MATERIAL, SPIRALLY WOUND INTO THE FORM OF A TUBE HAVING AN OPEN CENTRAL PASSAGE AND A PLURALITY OF HELICAL LAYERS OF POROUS WOVEN FABRIC AND UNWOVEN FIBROUS MATERIAL, THE FIBROUS MATERIAL LAYERS BEING COMPOSED OF
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |