US3759708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fibril mats and reinforced metal fibril mats
Assignee: Pall Filtration and Separations Group Inc
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Filing: 1972-07-03
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Granted: 1973-09-18
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Expires: 1992-07-03
Abstract
Abstract A RANDOMLY ORIENTED METAL FIBRAL MASS IS AIR LAID AND BOUND ON AT LEAST ONE SURFACE BY REINFORCEMENT. THE POROSITY OR DENSITY OF THE FIBRIL MASS MAY BE PRESELECTED AS DESIRED. THE FIBRILS IN THE MASS AND THE FIBRILS ADJACENT THE REINFORCEMENT CAN BE ATTACHED AT THEIR CONTACT POINTS TO STREGTHEN THE COMPOSITE. A FLAT OR TUBULAR FILTER CAN BE FASHIONED FROM THE REINFORCEMENT. THE GENERAL METHOD FOR MAKING THE REINFORCED FIBRIL MASS UTILIZES TECHNIQUES WHICH PROVIDE FOR, AMONG OTHER THINGS, GRADED DENSITIES.
Inventors
- 👤 B Sundberg
- 👤 A Luksch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:13
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2041; B01D39/2044; B22; B22F; B22F3/00; B22F3/002
Claims Analysis
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |