US3929648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter unit
Assignee: Individual
•
Filing: 1974-05-07
•
Granted: 1975-12-30
•
Expires: 1994-05-07
Abstract
Abstract A filter unit is provided for filtering impurities out of liquids. The unit has a first housing member and a second housing member, at least one of which is made of stiff, but flexible and resilient, plastic material. The two housing members can be clamped together by fastening means extending centrally therethrough with a filter paper between. The first housing member is adapted to be inverted over the second housing member so that the respective peripheries of the housing members engage each other along a peripheral line of engagement while the respective central portions are apart. Sealing pressure along the line of engagement is provided by drawing said central portions relatively towards each other.
Inventors
- 👤 Arthur Robert Cuthbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
A FILTER UNIT COMPRISING A FIRST HOUSING MEMBER HAVING A FLUID INLET; A SECOND HOUSING MEMBER HAVING A FLUID OUTLET, AN IRREGULAR CENTRAL SURFACE PORTION AND A SMOOTH GENERALLY PLANAR PERIPHERAL SURFACE PORTION; A GENERALLY FLAT FILTER PAPER OVERLYING SAID IRREGULAR AND PERIPHERAL SURFACE PORTIONS WITH SAID IRREGULAR SURFACE PORTION PROVIDING DRAINAGE PATHS TO SAID FLUID OUTLET; SAID FIRST HOUSING MEMBER BEING CONFIGURED AND POSITIONED TO DEFINE A FILTER CHAMBER BETWEEN ITSELF AND SAID FILTER PAPER AND HAVING A PERIPHERAL EDGE OPPOSITE SAID SMOOTH PERIPHERAL SURFACE OF SAID SECOND HOUSING MEMBER WITH SAID FILTER PAPER THEREBETWEEN; AND FASTENING MEANS EXTENDING CENTRALLY THROUGH SAID HOUSING MEMBERS AND SERVING TO CLAMP THEM TOGETHER AND TO CLAMP THE PERIPHERY OF SAID FILTER PAPER THEREBETWEEN, SAID FASTENING MEANS HOLDING THE CENTRAL PORTION OF SAID SECOND HOUSING MEMBER RESILIENTLY FLEXED TOWARD THE FIRST HOUSING MEMBER WHEREBY TO MAINTAIN SEALING PRESSURE BETWEEN SAID MEMBERS AND THE PERIPHERAL PORTION OF SAID FILTER PAPER.
Claim 2
Dependent Claim
156 words
A FILTER UNIT COMPRISING A FIRST HOUSING MEMBER HAVING A FLUID INLET; A SECOND HOUSING MEMBER HAVING A FLUID OUTLET, AN IRREGULAR CENTRAL SURFACE PORTION AND A SMOOTH GENERALLY PLANAR PERIPHERAL SURFACE PORTION; A GENERALLY FLAT FILTER PAPER OVERLYING SAID IRREGULAR AND PERIPHERAL SURFACE PORTIONS WITH SAID IRREGULAR SURFACE PORTION PROVIDING DRAINAGE PATHS TO SAID FLUID OUTLET; SAID FIRST HOUSING MEMBER BEING CONFIGURED AND POSITIONED TO DEFINE A FILTER CHAMBER BETWEEN ITSELF AND SAID FILTER PAPER AND HAVING A PERIPHERAL EDGE OPPOSITE SAID SMOOTH PERIPHERAL SURFACE OF SAID SECOND HOUSING MEMBER WITH SAID FILTER PAPER THEREBETWEEN; AND FASTENING MEANS EXTENDING CENTRALLY THROUGH SAID HOUSING MEMBERS AND SERVING TO CLAMP THEM TOGETHER AND TO CLAMP THE PERIPHERY OF SAID FILTER PAPER THEREBETWEEN, SAID FASTENING MEANS HOLDING THE CENTRAL PORTION OF SAID SECOND HOUSING MEMBER RESILIENTLY FLEXED TOWARD THE FIRST HOUSING MEMBER WHEREBY TO MAINTAIN SEALING PRESSURE BETWEEN SAID MEMBERS AND THE PERIPHERAL PORTION OF SAID FILTER PAPER.
Claim 3
Dependent Claim
27 words
A filter unit as claimed in claim 1 wherein said fastening means holds the central portions of both said housing members in engagement with said filter paper.
Claim 4
Dependent Claim
44 words
A filter unit as claimed in claim 2 including a washer on the fastening means between the two housing members to prevent leakage around the fastening means, and an outlet to evacuate air from the first housing member as it is filled with fluid.
Claim 5
Dependent Claim
42 words
A filter unit as claimed in claim 1 wherein the drainage paths of the second housing member define a slightly concave surface when the second housing member is not under stress and is bowed convexly upwardly when the fastening means are tightened.
Claim 6
Dependent Claim
32 words
A filter unit as claimed in claim 1 wherein there is a series of grooves in the inner drainage surface of the second housing member to carry filtrate to the fluid outlet.
Claim 7
Dependent Claim
43 words
A filter unit as claimed in claim 1 including a layer of diatomaceous earth within the first housing member and a deflector under the fluid inlet of the first housing member to prevent the diatomaceous earth from being washed away by incoming fluid.
Claim 8
Dependent Claim
38 words
A filter unit as claimed in claim 1 wherin the housing members are made of stiff, but flexible and resilient, material, the first housing member being cupshaped and relatively undeformable while the second housing member is relatively deformable.
Claim 9
Dependent Claim
24 words
A filter unit as claimed in claim 7 wherein the second housing member has a peripheral skirt which forms a stand for the filter.
Claim 10
Dependent Claim
36 words
A filter unit as claimed in claim 7 wherein the central portion of the first housing member is dimpled, rigidifying said housing member and providing an abutment for the central portion of the second housing member.
Claim 11
Dependent Claim
32 words
A filter unit as claimed in claim 7 wherein the peripheral edge of the first housing member tapers to said peripheral edge so that the edge can bite into the filter paper.
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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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |