US4886599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge with series elements for chemical and mechanical filtration
Assignee: Balzers und Leybold Deutschland Holding AG
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Filing: 1987-10-23
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Granted: 1989-12-12
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Expires: 2007-10-23
Abstract
Abstract A filter cartridge for cleaning oil of an oil sealed vacuum pump which comprises a cartridge housing, the cartridge housing being releasably mounted to the vacuum pump; filter materials including at least two types of filters having different characteristics, the filter materials including the filters being disposed in the cartridge housing.
Inventors
- 👤 Paul Bachmann
- 👤 Hanns-Peter Berges
- 👤 Wolfgang Leier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:03
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0058; B; B01; B01D; B01D27/00; B01D27/02; B01D27/04; B01D27/06; B01D36/00; B01D37/00; B01D37/02; B01D37/025; Y; Y10; Y10S; Y10S210/00; Y10S210/05; Y10S210/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A filter cartridge for cleaning oil contained in an oil sealed vacuum pump comprising: a cartridge housing, said cartridge housing being releasably mountable to the vacuum pump; a fluid path defined in said cartridge housing; and at least two types of filtering means having respectively different characteristics disposed in series in said cartridge housing along and forming a part of said fluid path, said filtering means including a mechanically acting filter stage and a chemically acting filter stage, said mechanically acting filter stage being disposed upstream of said chemically acting filter stage with respect to said fluid path, said chemically acting filter stage being composed of at least one of a chemical absorbent and adsorbent from the class consisting of fuller's earth and activated aluminum oxide in the form of a granulate having a grain size from 1 to 3 mm.
Claim 2
Dependent Claim
141 words
A filter cartridge for cleaning oil contained in an oil sealed vacuum pump comprising: a cartridge housing, said cartridge housing being releasably mountable to the vacuum pump; a fluid path defined in said cartridge housing; and at least two types of filtering means having respectively different characteristics disposed in series in said cartridge housing along and forming a part of said fluid path, said filtering means including a mechanically acting filter stage and a chemically acting filter stage, said mechanically acting filter stage being disposed upstream of said chemically acting filter stage with respect to said fluid path, said chemically acting filter stage being composed of at least one of a chemical absorbent and adsorbent from the class consisting of fuller's earth and activated aluminum oxide in the form of a granulate having a grain size from 1 to 3 mm.
Claim 3
Dependent Claim
18 words
A filter cartridge as defined in claim 1, wherein said mechanically acting filter stage is a paper filter.
Claim 4
Dependent Claim
25 words
A filter cartridge as defined in claim 2, wherein said paper filter is pleated so that the surface area of said paper filter is enlarged.
Claim 5
Dependent Claim
34 words
A filter cartridge as defined in claim 3, further comprising a folded screen-like mechanical support composed of a screen fabric, said screen fabric being downstream of said pleated paper filter in said flow direction.
Claim 6
Dependent Claim
31 words
A filter cartridge as defined in claim 2, wherein said paper filter is of a structure capable of trapping solid particles down to a grain size of less than 1 micron.
Claim 7
Dependent Claim
22 words
A filter cartridge as defined in claim 1, wherein said at least two filtering means being concentrically arranged in said filter housing.
Claim 8
Dependent Claim
45 words
A filter cartridge as defined in claim 6, further comprising a further mechanically acting filter stage, wherein said first-recited mechanically acting filter stage surrounds said chemically acting filter stage and said further mechanically acting filter stage is concentrically arranged within said chemically acting filter stage.
References Cited (Backward Citations)
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US3228527A
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US3662893A
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US3836005A
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US4231768A
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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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |