Patent US4494921A successfully refreshed from Google Patents.
US4494921A
Expired / Lapsed
US
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Filter element
Assignee: EIDP Inc
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Filing: 1983-08-08
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Granted: 1985-01-22
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Expires: 2003-08-08
Abstract
Abstract A spinneret assembly which includes a filter bed holder containing a filter element. The filter element increases in porosity from its center to its periphery.
Inventors
- 👤 Lyles H. Sowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:46
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; D01D1/00; D01D1/10; D01D1/106
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A layered filter bed element for removing contaminants from a molten fluid polymer stream flowing through the layer in a direction substantially normal to the layers, said filter bed element comprising: a compressed layer of formable powdered metal defined by a peripheral edge, said layer having a porosity that increases from its center toward its periphery.
Claim 2
Dependent Claim
56 words
A layered filter bed element for removing contaminants from a molten fluid polymer stream flowing through the layer in a direction substantially normal to the layers, said filter bed element comprising: a compressed layer of formable powdered metal defined by a peripheral edge, said layer having a porosity that increases from its center toward its periphery.
Claim 3
Dependent Claim
20 words
The filter bed element of claim 1, said layer having a circular shape, said porosity increasing in a radial direction.
Claim 4
Dependent Claim
24 words
The filter bed element of claim 1 or claim 2, said powdered metal being formed from a metal alloy comprising chromium, silicon and iron.
Claim 5
Dependent Claim
101 words
A spinneret assembly including a filter bed holder, said holder having a chamber defined from top to bottom by a first straight length, an outwardly tapered length, a second straight length and an inwardly tapered length; parts for clamping the holder to a molten polymer supply for feeding molten polymer in one direction through the holder to be spun as filaments; and a filter bed compressed in said chamber of said holder, said filter bed comprising a layer of formable powdered metal having a porosity that increases from its center to its periphery, said polymer flowing substantially normal to said layer.
Claim 6
Dependent Claim
101 words
A spinneret assembly including a filter bed holder, said holder having a chamber defined from top to bottom by a first straight length, an outwardly tapered length, a second straight length and an inwardly tapered length; parts for clamping the holder to a molten polymer supply for feeding molten polymer in one direction through the holder to be spun as filaments; and a filter bed compressed in said chamber of said holder, said filter bed comprising a layer of formable powdered metal having a porosity that increases from its center to its periphery, said polymer flowing substantially normal to said layer.
Claim 7
Dependent Claim
19 words
The spinneret of claim 4, said filter bed having a circular shape, said porosity increasing in a radial direction.
Claim 8
Dependent Claim
50 words
The spinneret of claim 4 or claim 5, said powdered metal being formed from a metal alloy, said alloy consisting essentially of about 30 to about 40 percent by weight chromium, about 2 to about 4 percent by weight silicon, minor amounts of carbon and nitrogen and the remainder iron.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |