Patent US3881896A successfully refreshed from Google Patents.
US3881896A
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Apparatus for filtering gaseous fluids
Assignee: Nestec SA
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Filing: 1972-10-18
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Granted: 1975-05-06
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Expires: 1992-10-18
Abstract
Abstract A filter for gaseous fluids includes a packing comprising quartz fibres. The filter may advantageously be used for sterilizing gases, for example gases used in fermentation processes.
Inventors
- 👤 Willy Rothmayr
- 👤 Jaroslav Dasek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:08
CPC Classifications
B; B01; B01D; B01D46/00; A; A61; A61L; A61L9/00; A61L9/015; A61L9/02; A61L9/03; Y; Y10; Y10S; Y10S55/00; Y10S55/45
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
PROCESS FOR STERILIZING A MICROORGANISM-CONTAINING GASEOUS FLUID WHICH COMPRISES PASSING THE FLUID THROUGH A GASPERMEABLE NON-COMPACTED MASS OF QUARTZ FIBERS, SAID FIBERS HAVING A DIAMETER OF BETWEEN 5 AND 15 MICRONS.
Claim 2
Dependent Claim
31 words
PROCESS FOR STERILIZING A MICROORGANISM-CONTAINING GASEOUS FLUID WHICH COMPRISES PASSING THE FLUID THROUGH A GASPERMEABLE NON-COMPACTED MASS OF QUARTZ FIBERS, SAID FIBERS HAVING A DIAMETER OF BETWEEN 5 AND 15 MICRONS.
Claim 3
Dependent Claim
18 words
Process according to claim 1 in which the quartz fibers are present in the form of quartz wool.
References Cited (Backward Citations)
US1914999A
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US2477964A
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US3056247A
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US3100146A
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US3261147A
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US3252270A
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US3745748A
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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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |