Patent US4201675A successfully refreshed from Google Patents.
US4201675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filter with novel seal means
Assignee: Individual
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Filing: 1978-12-14
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Granted: 1980-05-06
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Expires: 1998-12-14
Abstract
Abstract A liquid filter using a sheet of filter medium on a moveable conveyor where a contaminated liquid forms a pool above the conveyor and filter medium and is filtered therethrough into a filter compartment, contaminated liquid and filter being sealed from one another by a partial vacuum within the filter compartment pulling the filter medium against the conveyor in a sealed relationship with no other structures forming part of the seal.
Inventors
- 👤 Herbert R. Damerau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:11
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/09; B01D29/096; Y; Y10; Y10S; Y10S210/00; Y10S210/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
A liquid filter comprising, in combination: a conveyor; means cooperating with the conveyor to allow formation of a pool of a liquid to be filtered above the conveyor; a sheet of filter medium supported by the conveyor when passing through the pool; a compartment for collecting the filtrate obtained when the liquid passes through the filter medium; means for inducing a partial vacuum in the compartment; means for communicating the partial vacuum throughout the conveyor under the filter medium; the filter medium when passing through the pool mechanically unrestrained with respect to movement away from the conveyor and responsive to the partial vacuum in the conveyor so as to be pulled against the conveyor in a sealing relation; and a filter medium guide with lead-in means positioned for directing and folding a portion of the sheet sufficiently proximate with a side of the conveyor having holes communicating with the filtrate compartment so to enable the portion to seal the holes in response to the partial vacuum within the compartment.
Claim 2
Dependent Claim
169 words
A liquid filter comprising, in combination: a conveyor; means cooperating with the conveyor to allow formation of a pool of a liquid to be filtered above the conveyor; a sheet of filter medium supported by the conveyor when passing through the pool; a compartment for collecting the filtrate obtained when the liquid passes through the filter medium; means for inducing a partial vacuum in the compartment; means for communicating the partial vacuum throughout the conveyor under the filter medium; the filter medium when passing through the pool mechanically unrestrained with respect to movement away from the conveyor and responsive to the partial vacuum in the conveyor so as to be pulled against the conveyor in a sealing relation; and a filter medium guide with lead-in means positioned for directing and folding a portion of the sheet sufficiently proximate with a side of the conveyor having holes communicating with the filtrate compartment so to enable the portion to seal the holes in response to the partial vacuum within the compartment.
Claim 3
Dependent Claim
30 words
The filter as recited in claim 1 wherein the filter medium guide comprise a bar with a bevel portion located along the path of the conveyor where the pool begins.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |