Patent US3630384A successfully refreshed from Google Patents.
US3630384A
Expired / Lapsed
US
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Filter bed element for use in melt-spinning
Assignee: Teijin Ltd
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Filing: 1969-10-08
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Granted: 1971-12-28
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Expires: 1989-10-08
Abstract
Abstract A filter bed element for use in melt-spinning, which consists of a filter sand which has previously been molded using as a binder a synthetic high polymer having a melting point equal to or lower than that of the synthetic high polymer to be filtered.
Inventors
- 👤 Haruhiko Toda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:35
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2072; B01D39/2079; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/69; D; D01; D01D; D01D1/00; D01D1/10; D01D1/106; B29C48/03; B29C48/693; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A molded filter bed element for use in melt-spinning comprising filter sand and a binder, said binder being a synthetic high polymer having a melting point lower than that of the synthetic high polymer to be filtered.
Claim 2
Dependent Claim
37 words
A molded filter bed element for use in melt-spinning comprising filter sand and a binder, said binder being a synthetic high polymer having a melting point lower than that of the synthetic high polymer to be filtered.
Claim 3
Dependent Claim
24 words
The filter bed element of claim 1 wherein the synthetic high polymer binder is selected from the group consisting of polyethylene, polypropylene, and polybutene.
Claim 4
Dependent Claim
14 words
The filter bed of claim 2 wherein the synthetic high polymer binder is polyethylene.
Claim 5
Independent Claim
60 words
The method of preparing a filter bed element for use in melt-spinning comprising, in consecutive order: a. forming filter sand to the shaPe of the filter bed, and b. binding said formed filter sand with a synthetic high polymer having a melting point lower than that of the synthetic high polymer to be filtered, to form a molded filter bed.
Claim 6
Independent Claim
60 words
The method of preparing a filter bed element for use in melt-spinning comprising, in consecutive order: a. forming filter sand to the shaPe of the filter bed, and b. binding said formed filter sand with a synthetic high polymer having a melting point lower than that of the synthetic high polymer to be filtered, to form a molded filter bed.
Claim 7
Dependent Claim
16 words
The method of claim 4 wherein said filter bed element is then positioned in melt-spinning apparatus.
Claim 8
Dependent Claim
24 words
The method of claim 5 wherein said synthetic high polymer used as binding is dissolved by filtering said synthetic high polymer to be filtered.
Claim 9
Dependent Claim
22 words
The method of claim 4 wherein the synthetic high polymer binder is selected from the group consisting of polyethylene, polypropylene, and polybutene.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein the synthetic high polymer binder is polyethylene.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |