US3300558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing the cell walls of a resilient cellular filter material
Assignee: Walker Manufacturing Co
•
Filing: 1963-07-19
•
Granted: 1967-01-24
•
Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Robert F Grant
- 👤 Richard V Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/38; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5627
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE METHOD OF REMOVING CELL WALLS FROM COLUMNS IN RESILIENT CELLULAR FILTER MATERIAL, SAID MATERIAL HAVING RUPTURED CELL WALLS SO THAT THE CELLS CAN BE FILLED WITH WATER, WHICH COMPRISES FILLING ALL THE CELLS OF THE MATERIAL WITH WATER AND SIMULTANEOUSLY STRETCHING AND COMPRESSING THE CELLS BY PASSING THE MATERIAL IN STRIP FORM THROUGH A SET OF ROLLS SO AS TO MATERIALLY RAISE THE PRESSURE OF THE WATER IN THE COLUMNS OF THE CELLS AND THEREBY SHEAR AND TEAR THE CELL WALLS FROM THE FILTER MATERIAL.
Claim 2
Independent Claim
86 words
THE METHOD OF REMOVING CELL WALLS FROM COLUMNS IN RESILIENT CELLULAR FILTER MATERIAL, SAID MATERIAL HAVING RUPTURED CELL WALLS SO THAT THE CELLS CAN BE FILLED WITH WATER, WHICH COMPRISES FILLING ALL THE CELLS OF THE MATERIAL WITH WATER AND SIMULTANEOUSLY STRETCHING AND COMPRESSING THE CELLS BY PASSING THE MATERIAL IN STRIP FORM THROUGH A SET OF ROLLS SO AS TO MATERIALLY RAISE THE PRESSURE OF THE WATER IN THE COLUMNS OF THE CELLS AND THEREBY SHEAR AND TEAR THE CELL WALLS FROM THE FILTER MATERIAL.
References Cited (Backward Citations)
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US3060137A
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US3239585A
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US3196975A
Cited
US3194854A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |