Patent US3015797A successfully refreshed from Google Patents.
Patent US4053420A successfully refreshed from Google Patents.
US4053420A
Expired / Lapsed
US
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Blood filter
Assignee: Dr Eduard Fresenius Chemisch Pharmazeutische Industrie KG
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Filing: 1976-04-12
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Granted: 1977-10-11
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Expires: 1996-04-12
Abstract
Abstract A blood filter for removing dead blood corpuscles, conglomerations of bloodorpuscles and foreign components from the blood comprises dense wadding formed from a plastics monofilament or a bundle of long plastics threads.
Inventors
- 👤 Gunter Helmut Marx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:00
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; A; A61; A61M; A61M5/00; A61M5/14; A61M5/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A filter for removing decayed blood corpuscles, aggregations of blood corpuscles and foreign components from the blood, comprising a filter housing having an inlet and an outlet, said housing containing a dense packing of fibres having substantially the same diameter as the blood corpuscles, said packing consisting of at least one plastics thread of sufficient length to prevent said at least one plastics thread from being carried away by the blood and from being released from said packing, said at least one plastics thread being crimped and arranged to form a mesh having a mesh width functioning to allow healthy blood cells to pass therethrough, said at least one plastics thread being formed from a material which will repel healthy blood cells, said decayed blood cells and said aggregations of blood corpuscles having no negative electric potential and thereby becoming deposited on said packing.
Claim 2
Dependent Claim
144 words
A filter for removing decayed blood corpuscles, aggregations of blood corpuscles and foreign components from the blood, comprising a filter housing having an inlet and an outlet, said housing containing a dense packing of fibres having substantially the same diameter as the blood corpuscles, said packing consisting of at least one plastics thread of sufficient length to prevent said at least one plastics thread from being carried away by the blood and from being released from said packing, said at least one plastics thread being crimped and arranged to form a mesh having a mesh width functioning to allow healthy blood cells to pass therethrough, said at least one plastics thread being formed from a material which will repel healthy blood cells, said decayed blood cells and said aggregations of blood corpuscles having no negative electric potential and thereby becoming deposited on said packing.
Claim 3
Dependent Claim
17 words
The filter of claim 1 in which said at least one plastics thread has a star-shaped cross-section.
Claim 4
Dependent Claim
23 words
The filter of claim 1 in which said at least one plastics thread has its ends joined together to form an endless thread.
Claim 5
Dependent Claim
43 words
The filter of claim 1 in which said packing comprises filter layers formed from said at least one plastics thread in which layers having a substantially parallel thread course are superposed so that said at least one plastics thread extends in different directions.
Claim 6
Dependent Claim
21 words
The filter of claim 1 in which a plurality of said at least one plastics thread are formed into a cord.
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |