US4332679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for indicating the degree of exhaustion of an adsorption filter
Assignee: ZF Friedrichshafen AG
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Filing: 1981-01-19
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Granted: 1982-06-01
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Expires: 2001-01-19
Abstract
Abstract A filtering apparatus for indicating the degree of exhaustion of an adsorption filter which includes a mechanical filter and a pressure meter for detecting the difference in pressure between a point downstream and a point upstream of the mechanical filter to provide an indication of the degree of exhaustion of the adsorption filter. The mechanical filter may be an internal type filter or a surface filter and it may be either series-connected or connected in shunt with the flow path of the adsorption filter.
Inventors
- 👤 Bernd Hengst
- 👤 Wolfgang Grosspietsch
- 👤 Karl-Heinz Ognibeni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:52
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D35/00; B01D35/14; B01D35/143; B01D2201/00; B01D2201/04; B01D2201/0407
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A filtering apparatus for detecting the degree of exhaustion of an adsorption filter comprising mechanical filter means arranged in flow communication with said adsorption filter, pressure sensing means for sensing fluid pressure proximate said mechanical filter means both upstream and downstream thereof, and means for detecting the difference between fluid pressure sensed upstream and downstream of said mechanical filter means to provide an indication of the degree of exhaustion of said adsorption filter based upon said fluid pressure difference, said mechanical filter means being connected in shunt with the flow path of said adsorption filter.
Claim 2
Dependent Claim
95 words
A filtering apparatus for detecting the degree of exhaustion of an adsorption filter comprising mechanical filter means arranged in flow communication with said adsorption filter, pressure sensing means for sensing fluid pressure proximate said mechanical filter means both upstream and downstream thereof, and means for detecting the difference between fluid pressure sensed upstream and downstream of said mechanical filter means to provide an indication of the degree of exhaustion of said adsorption filter based upon said fluid pressure difference, said mechanical filter means being connected in shunt with the flow path of said adsorption filter.
Claim 3
Dependent Claim
19 words
Apparatus according to claim 1 wherein said mechanical filter comprises one of an internal type filter and surface filter.
Claim 4
Dependent Claim
20 words
Apparatus according to claim 1 wherein said mechanical filter means is formed of solid structural material of the adsorption filter.
Claim 5
Dependent Claim
16 words
Apparatus according to claim 3 wherein said solid structural material comprises powdery or granular filter material.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 1 wherein said adsorption filter is composed of filter material bounded by wall means and wherein said mechanical filter means is formed of said wall means of said adsorption filter.
Claim 7
Dependent Claim
14 words
Apparatus according to claim 5 wherein said wall means are formed of porous material.
Claim 8
Dependent Claim
16 words
Apparatus according to claim 5 wherein said wall means are formed with a plurality of openings.
Claim 9
Dependent Claim
27 words
Apparatus according to claim 1 wherein said mechanical filter means and said pressure sensing means are formed as an individual structural unit separate from said adsorption filter.
Claim 10
Dependent Claim
16 words
Apparatus according to claim 1 wherein said mechanical filter means is adapted to be back flushed.
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |