Patent US3834253A successfully refreshed from Google Patents.
Patent US3570674A successfully refreshed from Google Patents.
US3570674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filter apparatus
Assignee: American Air Filter Co Inc
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Filing: 1969-10-14
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Granted: 1971-03-16
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Expires: 1989-10-14
Abstract
Abstract A liquid filter assembly disposable in a liquid tank comprising an endless filter screen mounted by support members on a conveyor belt means, the endless filter screen being provided with an overlap expansion arrangement to permit expansion of the filter screen with expansion of the conveyor belt means, the expansion arrangement having tensioning and restraining means mounted to the conveyor belt means and cooperating therewith to restrain the free portion of the filter screen means from falling off its support members.
Inventors
- 👤 Francis E Dahlem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:18
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/04; B01D33/44; B01D33/46; B01D33/463
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A liquid filter assembly for removing contaminant particulates from liquids in a liquid tank comprising: longitudinally extending spaced opposed wall members; opposed conveyor belt means mounted on each of the said wall members in endless loop fashion; drive means connected to said conveyor belt means to drive the same; a plurality of spaced screen support members mounted to said opposed conveyor belt means; flexible filter screen means including leading edge, body and trailing edge portions mounted in looped fashion about said spaced screen support members with said leading edge portions of said filter screen means being fastened to one of said support members, the body portion resting in free fashion on successive support members, and the trailing edge portion overlapping an immediately successive leading edge portion to permit expansion of said filter screen means with expansion of said conveyor belt means; and tensioning and restraining means mounted to said conveyor belt means to restrain said free portion of said filter screen means from falling off said support means and hold said filter screen means in tension.
Claim 2
Dependent Claim
176 words
A liquid filter assembly for removing contaminant particulates from liquids in a liquid tank comprising: longitudinally extending spaced opposed wall members; opposed conveyor belt means mounted on each of the said wall members in endless loop fashion; drive means connected to said conveyor belt means to drive the same; a plurality of spaced screen support members mounted to said opposed conveyor belt means; flexible filter screen means including leading edge, body and trailing edge portions mounted in looped fashion about said spaced screen support members with said leading edge portions of said filter screen means being fastened to one of said support members, the body portion resting in free fashion on successive support members, and the trailing edge portion overlapping an immediately successive leading edge portion to permit expansion of said filter screen means with expansion of said conveyor belt means; and tensioning and restraining means mounted to said conveyor belt means to restrain said free portion of said filter screen means from falling off said support means and hold said filter screen means in tension.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1, said tensioning and restraining means including spring rod members mounted to the conveyor belt means, with an extending portion thereof cooperating with said trailing edge portion of said filter screen means to hold the same in tension.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2, said trailing edge portion of said filter screen means having a bracket fixed thereto with said extending portion in cooperative relationship therewith.
Claim 5
Dependent Claim
36 words
The apparatus of claim 3, said bracket being of U-shaped cross section and extending transversely above said screen means between said opposed conveyor belt means with said extending portion of said spring rod member nesting therein.
References Cited (Backward Citations)
US3288296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |