Patent US2228797A successfully refreshed from Google Patents.
Patent US3731815A successfully refreshed from Google Patents.
US3731815A
Expired / Lapsed
US
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Filter and method of manufacture
Assignee: Honeywell International Inc
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Filing: 1972-04-26
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Granted: 1973-05-08
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Expires: 1992-04-26
Abstract
Abstract Filters for petroleum based liquids and the like are manufactured from heat-treated fabric composed of filaments prepared from blended composite fibers. In general the filter is characterized by light weight, corrosion resistance, compatibility with petroleum based liquids, low cost, dimensional stability, and resistance to shock and other mechanical abuse.
Inventors
- 👤 G Collingwood
- 👤 R Wincklhofer
- 👤 G Weedon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:50
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/09; B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/50; B01D29/56; B01D29/58; B01D35/00; B01D35/02; B01D35/023
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
27 words
An article as defined in claim 1 wherein said different polymeric materials are selected from the group consisting of polyolefins, polyamides, polyesters, polysulfones, polyphenylene oxides and polycarbonates.
Claim 2
Dependent Claim
17 words
An article as defined in claim 2 wherein said polymeric materials are extruded in continuous side-by-side relationship.
Claim 3
Dependent Claim
25 words
An article as defined in claim 2 wherein said polymeric materials are extruded in a sheath-core relationship, the sheath component being of lower melting material.
Claim 4
Dependent Claim
22 words
An article as defined in claim 2 wherein one polymeric material is a polyamide and the other polymeric material is a polyester.
Claim 5
Dependent Claim
36 words
The filter of claim 1 wherein said porous layer is surrounded by a flange with a substantial portion of said layer inside said flange lying in a different plane from said flange such as a cone.
Claim 6
Dependent Claim
13 words
A filter of claim 6 mounted in a conduit for conveying petroleum products.
Claim 7
Dependent Claim
33 words
An article as defined in claim 1 wherein the mechanically blended filaments are comprised of staple fibers prepared from at least two polymeric materials having melt temperatures differing by at least 10* C.
Claim 8
Independent Claim
116 words
The method of making a filter by: taking filaments of the class consisting of multi-component filaments comprised of at least two different polymeric materials joined together in individual filaments by concurrent extrusion in intimate composite relationship and mechanically blended filaments comprised of at least two different polymeric materials, said filaments consisting of a first polymer having a melting point at least 10*C lower than a second polymer, fabricating said filaments into a porous textile material, and forming said textile material into a filter by self-bonding filaments to one another at their points of intersection by heating to a temperature above the fusion point of said first polymer and below the fusion point of said second polymer.
Claim 9
Dependent Claim
38 words
The process of claim 9 wherein a multiplicity of filaments are plied into a yarn which is then used for fabricating into a porous textile material, the diameter of said yarn being materially reduced by said heating step.
Claim 10
Dependent Claim
18 words
The process of claim 9 wherein the heating step is carried out between about 230* and 250* C.
Claim 11
Dependent Claim
46 words
The process of claim 11 wherein a multiplicity of said filaments are plied into a yarn which is then fabricated into a proous textile material, the diameter of said yarn being materially reduced by said heating step due to the self-bonding and consolidation of adjacent filaments.
Claim 12
Dependent Claim
31 words
The process of claim 12 wherein said forming step includes clamping a layer of said textile material about a periphery and pressing that portion inside the periphery into a three-dimensional shape.
Claim 13
Dependent Claim
31 words
The process of claim 13 wherein the textile material is free to retract whereby the interstices of said mateRial are reduced from shrinkage of said material to form a microporus structure.
References Cited (Backward Citations)
US2732946A
Cited
FR1310150A
Cited
US3382305A
Cited
US3038235A
Cited
US3099067A
Cited
GB930074A
Cited
GB1076175A
Cited
GB1043762A
Cited
US3500991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |