Patent US5242461A successfully refreshed from Google Patents.
US2528847A
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Filter cloth and process of preparing same
Assignee: Metakloth Co
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Filing: 1948-08-20
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Granted: 1950-11-07
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Expires: 1968-08-20
Abstract
No abstract record available.
Inventors
- 👤 Ottomar H Van Norden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:45
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/08; D; D06; D06M; D06M13/00; D06M13/02; B01D2239/00; B01D2239/04; B01D2239/0464
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE PROCESS OF TREATING FILTER CLOTH TO PREPARE IT FOR USE IN THE FILTRATION OF ALKALINE AQUEOUS LIQUIDS, COMPRISING IMPREGNATING A CLOTH IN A SINGLE BATH COMPRISING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF AMETAL SELECTED FROM THE GROUP CONSISTING OF CERIUM, ZIRCONIUM AND LANTHANIUM, AND AN EMULSION OF A MINERAL WAX HAVING AN AQUEOUS CONTINUOUS PHASE, SAID EMULSION BEING STABILIZED BY THE PRESENCE IN THE BATH OF AN EMULSIFYING AGENT, WHILE MAINTAINING THE PH OF SAID SOLUTION BETWEEN 7 AND ABOUT 9, AND THEREAFTER DRYING THE CLOTH.
Claim 2
Dependent Claim
89 words
THE PROCESS OF TREATING FILTER CLOTH TO PREPARE IT FOR USE IN THE FILTRATION OF ALKALINE AQUEOUS LIQUIDS, COMPRISING IMPREGNATING A CLOTH IN A SINGLE BATH COMPRISING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT OF AMETAL SELECTED FROM THE GROUP CONSISTING OF CERIUM, ZIRCONIUM AND LANTHANIUM, AND AN EMULSION OF A MINERAL WAX HAVING AN AQUEOUS CONTINUOUS PHASE, SAID EMULSION BEING STABILIZED BY THE PRESENCE IN THE BATH OF AN EMULSIFYING AGENT, WHILE MAINTAINING THE PH OF SAID SOLUTION BETWEEN 7 AND ABOUT 9, AND THEREAFTER DRYING THE CLOTH.
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) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |