US2707308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a filter element
Assignee: Acordis UK Ltd
•
Filing: 1949-12-06
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Granted: 1955-05-03
•
Expires: 1969-12-06
Abstract
No abstract record available.
Inventors
- 👤 Taylor William Ivan
- 👤 Grebby John William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0204; A24D3/0212; A24D3/022; Y; Y10; Y10S; Y10S264/00; Y10S264/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
METHOD FOR PRODUCING A RESILIENT FILTER ELEMENT OF SUBSTANTIALLY UNIFORM TEXTURE, WHICH COMPRISES FORMING A LAPP OF ALLGNES CRINKLE FIBERS, WETTING THE FIBERS WITH AN AQUEOUS ADHESIVE CONTAINING A WATER-SOLUBLE CELLULOSE DERIVATIVE IN LOW CONCENTRATION, DRAWING THE WET LAP THROUGH A PLURALITY OF DIES SO AS TO REMOVE EXCESS ADHESIVE AND PRODUCE A ROD OF THE REQUIRED DIMENSIONS, AND DRYING THE ROD BY EVAPORATION OF THE WATER TO LEAVE A FILM OF THE WATER-SOLUBLE CELLULOSE DERIVATIVE BINDING SAID FIBERS TOGETHER THROUGHOUT THE ROD WHILE LEAVING THE ROD PERVIOUS TO AIR IN THE GENERAL DIRECTION OF THE LENGTH OF THE FIBERS.
Claim 2
Dependent Claim
100 words
METHOD FOR PRODUCING A RESILIENT FILTER ELEMENT OF SUBSTANTIALLY UNIFORM TEXTURE, WHICH COMPRISES FORMING A LAPP OF ALLGNES CRINKLE FIBERS, WETTING THE FIBERS WITH AN AQUEOUS ADHESIVE CONTAINING A WATER-SOLUBLE CELLULOSE DERIVATIVE IN LOW CONCENTRATION, DRAWING THE WET LAP THROUGH A PLURALITY OF DIES SO AS TO REMOVE EXCESS ADHESIVE AND PRODUCE A ROD OF THE REQUIRED DIMENSIONS, AND DRYING THE ROD BY EVAPORATION OF THE WATER TO LEAVE A FILM OF THE WATER-SOLUBLE CELLULOSE DERIVATIVE BINDING SAID FIBERS TOGETHER THROUGHOUT THE ROD WHILE LEAVING THE ROD PERVIOUS TO AIR IN THE GENERAL DIRECTION OF THE LENGTH OF THE FIBERS.
References Cited (Backward Citations)
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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) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |