US3727767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double filter unit
Assignee: Oerlikon Barmag AG
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Filing: 1971-10-07
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Granted: 1973-04-17
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Expires: 1991-10-07
Abstract
Abstract Double filter unit embodying two parallel filter pots with replaceable filters, two bars intersecting and connecting the filter pots, a loop passage in each bar, an inlet pipe on one bar, an outlet pipe on the other bar, and valved ports in each bar connecting the loop passages with the inlet and outlet passages of respective filter pots for selective closing off during filter change or cleaning.
Inventors
- 👤 G Zimmerbeutel
- 👤 F Itter
- 👤 M Feth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:04
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/88; B01D29/90; B01D29/92; B01D29/925; B01D36/00; B01D36/001; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/69; B29C48/691; B29C48/694; B29C48/03
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A device for filtering liquids of high viscosity, particularly melts of thermoplastic synthetic polymers which comprises a filter unit having an inlet pipe and an outlet pipe, two parallel filter casings, a removable filter pot mounted in each casing, each filter pot having an inlet passage and an outlet passage, connecting means joining said casings and containing branch passages, said branch passages being loop passages connected by tap lines with respective inlet and outlet passages of said filter pots, valve seats in said tap lines, shut off valves for respective valve seats for selectively opening and closing liquid flow between said loop passages and said filter pots, and means sealing the connections between respective tap lines and the inlet and outlet passages of the respective filter pots.
Claim 2
Independent Claim
127 words
A device for filtering liquids of high viscosity, particularly melts of thermoplastic synthetic polymers which comprises a filter unit having an inlet pipe and an outlet pipe, two parallel filter casings, a removable filter pot mounted in each casing, each filter pot having an inlet passage and an outlet passage, connecting means joining said casings and containing branch passages, said branch passages being loop passages connected by tap lines with respective inlet and outlet passages of said filter pots, valve seats in said tap lines, shut off valves for respective valve seats for selectively opening and closing liquid flow between said loop passages and said filter pots, and means sealing the connections between respective tap lines and the inlet and outlet passages of the respective filter pots.
Claim 3
Dependent Claim
29 words
A device as claimed in claim 1, and pressure-exerting mounting means mounting respective filter pots in said casings and simultaneously pressing said sealing means to provide a fluid-tight joint.
Claim 4
Dependent Claim
19 words
A device as claimed in claim 1, said connecting means being a pair of bars extending between said casings.
Claim 5
Dependent Claim
26 words
A device as claimed in claim 3, said loop passages comprising longitudinal bores in said bars, and said tap lines being bores intersecting said longitudinal bores.
Claim 6
Dependent Claim
26 words
A device as claimed in claim 1, said sealing means being a sealing ring mounted in the respective inlet and outlet openings of said filter pots.
Claim 7
Dependent Claim
32 words
A device as claimed in claim 1, each filter pot comprising a hollow base and a cap or cover defining an enclosed filter chamber, and a filter member mounted in said chamber.
Claim 8
Dependent Claim
41 words
A device as claimed in claim 6, said filter comprising a hollow supporting body closed at its inlet side, transverse passages through the side of said supporting body and one or more filter screens supporting said body and covering said bores.
Claim 9
Dependent Claim
28 words
A device as claimed in claim 7, said supporting body being a hollow cylinder and said filter screen or screens being hollow cylinders fitted about said supporting body.
Claim 10
Dependent Claim
15 words
A device as claimed in claim 8, and an annular flange on said supporting body.
Claim 11
Dependent Claim
37 words
A device as claimed in claim 9, said flange being positioned between said hollow base and said cap or cover, and removable fastening means holding said hollow base, said annular flange and said cap or cover together.
Claim 12
Dependent Claim
23 words
A device as claimed in claim 10, said supporting body being suspended in said chamber of said filter unit by said annular flange.
Claim 13
Dependent Claim
15 words
A device as claimed in claim 7, and an expeller core within said supporting body.
Claim 14
Dependent Claim
33 words
A device as claimed in claim 1, and gas vent lines intersecting the outlet passage of said filter pot and also the space between the filter screen and the wall of said chamber.
Claim 15
Dependent Claim
21 words
A device as claimed in claim 1, said connecting means comprising two members positioned on the same side of respective casings.
Claim 16
Dependent Claim
77 words
A device as claimed in claim 1, said valves having respective valve chambers extending transversely across the loop passages, valve heads of said valves having only their rear faces exposed to melt flowing through said annular passages and valve chambers when said valves are closed, and the valve stems thereof extending axially through said valve chambers, said stems being washed with liquid flowing through said loop passages and valve chambers when the valve is in closed position.
References Cited (Backward Citations)
US1189566A
Cited
US3056499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |