US3353982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a filter
Assignee: Selas Corp of America
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Filing: 1964-05-01
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Granted: 1967-11-21
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Expires: 1984-05-01
Abstract
No abstract record available.
Inventors
- 👤 Blaha Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:10
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0044; B01D69/00; B01D69/10; B01D69/105; B01D71/00; B01D71/02; B01D71/022; B01D2323/00; B01D2323/15; B01D2323/21; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
THE METHOD OF MAKING A FILTER WHICH COMPRISES PROVIDING A RIGID POROUS, SUPPORT HAVING PORES LARGER THAN THOSE OF THE FINISHED FILTER AND HAVING A SURFACE THE SHAPE THE FILTER IS TO TAKE, FILLING THE PORES ON SAID SURFACE WITH A FILLER, PLACING A FILM OF A METAL OXIDE AND A BINDER ON SAID SURFACE OF A THICKNESS SUBSTANTIALLY EQUAL TO THAT OF THE FINISHED FILTER, HEATING THE SUPPORT AND FILM TO A TEMPERATURE SUFFICIENT TO BURN OUT THE BINDER AND DECOMPOSE THE OXIDE TO SUBSTANTIALLY PURE METAL, THEREBY TO PRODUCE ON SAID SUPPORT AN INTEGRAL THIN, POROUS METAL FILM, AND LEACH OUT THE FILLER FROM THE PORES OF SAID SUPPORT.
Claim 2
Independent Claim
111 words
THE METHOD OF MAKING A FILTER WHICH COMPRISES PROVIDING A RIGID POROUS, SUPPORT HAVING PORES LARGER THAN THOSE OF THE FINISHED FILTER AND HAVING A SURFACE THE SHAPE THE FILTER IS TO TAKE, FILLING THE PORES ON SAID SURFACE WITH A FILLER, PLACING A FILM OF A METAL OXIDE AND A BINDER ON SAID SURFACE OF A THICKNESS SUBSTANTIALLY EQUAL TO THAT OF THE FINISHED FILTER, HEATING THE SUPPORT AND FILM TO A TEMPERATURE SUFFICIENT TO BURN OUT THE BINDER AND DECOMPOSE THE OXIDE TO SUBSTANTIALLY PURE METAL, THEREBY TO PRODUCE ON SAID SUPPORT AN INTEGRAL THIN, POROUS METAL FILM, AND LEACH OUT THE FILLER FROM THE PORES OF SAID SUPPORT.
Claim 3
Independent Claim
114 words
THE METHOD OF MAKING A SUPPORTED METAL FILTER WHICH COMPRISES PREPARING A POROUS CERAMIC SUPPORT HAVING PORES OF A PREDETERMINED SIZE BY FILLING THE PORES ON AT LEAST ONE SURFACE THEREOF WITH A FILLER AND SMOOTHING SAID SURFACE, COATING SAID SURFACE WITH A FILM OF A SOLUTION CONSISTING OF POWDERED SILVER OXIDE, A BINDER AND A SOLVENT FOR THE BINDER, PERMITTING THE SOLVENT TO EVAPORATE, HEATING THE SUPPORT TO BURN OUT THE BINDER AND DECOMPOSE THE SILVER OXIDE TO A POROUS FILM OF SUBSTANTIALLY PURE SILVER INTEGRALLY ATTACHED TO THE SUPPORT WITH THE PORES IN THE SILVER SMALLER THAN THE PORES IN SAID SUPPORT, AND LEACHING THE FILLER FROM THE PORES OF SAID SUPPORT.
Claim 4
Independent Claim
114 words
THE METHOD OF MAKING A SUPPORTED METAL FILTER WHICH COMPRISES PREPARING A POROUS CERAMIC SUPPORT HAVING PORES OF A PREDETERMINED SIZE BY FILLING THE PORES ON AT LEAST ONE SURFACE THEREOF WITH A FILLER AND SMOOTHING SAID SURFACE, COATING SAID SURFACE WITH A FILM OF A SOLUTION CONSISTING OF POWDERED SILVER OXIDE, A BINDER AND A SOLVENT FOR THE BINDER, PERMITTING THE SOLVENT TO EVAPORATE, HEATING THE SUPPORT TO BURN OUT THE BINDER AND DECOMPOSE THE SILVER OXIDE TO A POROUS FILM OF SUBSTANTIALLY PURE SILVER INTEGRALLY ATTACHED TO THE SUPPORT WITH THE PORES IN THE SILVER SMALLER THAN THE PORES IN SAID SUPPORT, AND LEACHING THE FILLER FROM THE PORES OF SAID SUPPORT.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |