US3701433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for use in the filtration of blood
Assignee: Pall Corp
•
Filing: 1970-11-10
•
Granted: 1972-10-31
•
Expires: 1990-11-10
Abstract
Abstract A filter element is provided for use in the filtration of blood such as in cardiopulmonary bypass techniques in open heart surgery, comprising a woven square weave mesh of polyester monofilaments having a pore size within the range from about 25 to about 50 microns.
Inventors
- 👤 Sidney Krakauer
- 👤 David Rosenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:08
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; B01D27/00; B01D27/005; B01D27/04; B01D27/06; B01D36/00; B01D36/001; B01D36/02; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0668; B01D2239/12; B01D2239/1216; B01D2239/1233; B01D2239/1291
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
26 words
A disposable filter element in accordance with claim 1, in which the monofilaments have a diameter within the range from about 25 to about 50 microns.
Claim 2
Dependent Claim
23 words
A disposable filter element in accordance with claim 1, in which the polyester monofilaments are a polyester of ethylene glycol and terephthalic acid.
Claim 3
Dependent Claim
36 words
A disposable filter element in accordance with claim 1, in which the polyester monofilament mesh is composed of polyester monofilaments 40 microns in diameter with a mesh opening of 53 microns and 33 percent open area.
Claim 4
Dependent Claim
36 words
A disposable filter element in accordance with claim 1, in which the polyester monofilament mesh is composed of polyester monofilaments 40 microns in diameter with a mesh opening of 44 microns and 27 percent open area.
Claim 5
Dependent Claim
36 words
A disposable filter element in accordance with claim 1, in which the polyester monofilament mesh is composed of polyester monofilaments 40 microns in diameter with a mesh opening of 37 microns and 23 percent open area.
Claim 6
Dependent Claim
21 words
A disposable filter element in accordance with claim 1, in which the filaments are heat set to lock them in place.
Claim 7
Dependent Claim
59 words
A disposable filter unit comprising a filter element according to claim 1 and a housing having an inlet and an outlet and line connections thereat for fluid flow into and out from the housing, the filter element being disposed in the housing across the line of flow therebetween so that fluid flow therebetween must pass through the filter element.
Claim 8
Dependent Claim
33 words
A disposable filter unit in accordance with claim 8, in which the filter element is cylindrical and one line connection has a direct fluid flow connection to the interior of the filter cylinder.
Claim 9
Dependent Claim
23 words
A disposable filter unit in accordance with claim 8, in which the housing has an air vent closed off by a removable cap.
Claim 10
Dependent Claim
40 words
A disposable filter unit in accordance with claim 10, in which the cap closes off the vent in a tapered seal, the vent having a tapered bore, and the cap a tapered member projecting into and seating in the bore.
Claim 11
Dependent Claim
18 words
A disposable filter unit in accordance with claim 8, having a housing made in two portions bonded together.
Claim 12
Dependent Claim
20 words
A disposable filter unit in accordance with claim 12, made of plastic, with the portions fused together into one piece.
Claim 13
Dependent Claim
16 words
A disposable filter unit in accordance with claim 13, including line connections integral with the housing.
Claim 14
Dependent Claim
18 words
A disposable filter unit in accordance with claim 13, having the filter unit bonded to one housing portion.
Claim 15
Dependent Claim
39 words
A disposable filter unit in accordance with claim 15, having the filter unit bonded to one housing portion at the outlet with a direct fluid flow line connection from the filtrate-flow side of the filter element to the outlet.
Claim 16
Dependent Claim
41 words
A disposable filter unit in accordance with claim 8, having an air vent closed off by a removable cap, and a barrier At the inlet and attached to the housing in a position to shield the air vent from inlet flow.
Claim 17
Dependent Claim
21 words
A disposable filter unit in accordance with claim 17 in which the barrier and air vent are integral with the housing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |