US3841484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filter with color indicator
Assignee: HUNTER D ENG Ltd
•
Filing: 1973-04-02
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Granted: 1974-10-15
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Expires: 1993-04-02
Abstract
Abstract A fluid filter for indicating by color the presence of an excessive amount of a given substance. A housing is formed at opposed end regions with a fluid inlet and a fluid outlet, and this housing has in its interior a micro-fibre cylinder which is hollow and which is spaced from the side wall of the housing between the fluid inlet and fluid outlet to define a passage with the housing. The fluid which enters through the inlet must first flow to the interior of the cylinder before reaching the passage between the latter and the housing. Packed within the fibre cylinder between the interior thereof and the inlet is an adsorbent medium having distributed therein dye particles soluble in the substance which is detected so that when the latter substance is present in an excessive amount in the fluid the dye particles dissolve to release a coloring medium which contrasts with the color of the micro-fibre cylinder so as to discolor the latter. The housing is constructed in such a way that it is possible to see the cylinder through the wall of the housing, and in this way an indication will be given of the presence of the undesirable substance in the fluid.
Inventors
- 👤 K Domnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:27
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; B; B01; B01D; B01D15/00; B01D35/00; B01D35/14; B01D35/143; B01D46/00; B01D46/30; B01D46/40; B01D53/00; B01D53/02; B01D2201/00; B01D2201/30; B01D2201/309
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
281 words
In a filter device for fluids, a filter cartridge comprising a housing means having opposed end regions and being formed with a fluid inlet at one of said end regions and a fluid outlet spaced from said inlet and situated at the other of said end regions, a micro-fibre cylinder means supported within said housing means for separating said fluid outlet from said fluid inlet, said cylinder means having a hollow interior communicating with said inlet, and said housing means having a side wall spaced from and surrounding an exterior side surface of said cylinder means to define therewith a passage through which fluid flows after passing from said inlet to the interior of said cylinder means and through the wall thereof to said passage before reaching said fluid outlet, said housing means coacting with said cylinder means for rendering the latter visible through said housing means, an adsorbent filter medium packed within the cylinder means, diffuser means disposed between said fluid inlet and the adsorbent medium for distributing fluid entering through said fluid inlet to said filter medium packed within said cylinder means, and oil-soluble dye means distributed within the adsorbent medium for responding to the presence of oil in fluid which enters through said inlet to release a dye having a color contrasting with that of said cylinder means and carried with the fluid through said cylinder means before reaching said passage, said cylinder means coacting with the dye released by said dye means when oil is present in the fluid to be discolored by said dye so that when the discolored cylinder is seen through said housing means it is known that oil is present in the fluid.
Claim 2
Dependent Claim
281 words
In a filter device for fluids, a filter cartridge comprising a housing means having opposed end regions and being formed with a fluid inlet at one of said end regions and a fluid outlet spaced from said inlet and situated at the other of said end regions, a micro-fibre cylinder means supported within said housing means for separating said fluid outlet from said fluid inlet, said cylinder means having a hollow interior communicating with said inlet, and said housing means having a side wall spaced from and surrounding an exterior side surface of said cylinder means to define therewith a passage through which fluid flows after passing from said inlet to the interior of said cylinder means and through the wall thereof to said passage before reaching said fluid outlet, said housing means coacting with said cylinder means for rendering the latter visible through said housing means, an adsorbent filter medium packed within the cylinder means, diffuser means disposed between said fluid inlet and the adsorbent medium for distributing fluid entering through said fluid inlet to said filter medium packed within said cylinder means, and oil-soluble dye means distributed within the adsorbent medium for responding to the presence of oil in fluid which enters through said inlet to release a dye having a color contrasting with that of said cylinder means and carried with the fluid through said cylinder means before reaching said passage, said cylinder means coacting with the dye released by said dye means when oil is present in the fluid to be discolored by said dye so that when the discolored cylinder is seen through said housing means it is known that oil is present in the fluid.
Claim 3
Dependent Claim
27 words
A filter cartridge according to claim 1, wherein said inlet is provided in an end wall of said housing means situated at said one end region thereof.
Claim 4
Dependent Claim
36 words
A filter cartridge according to claim 2, wherein said housing means is transparent for rendering said cylinder means visible through said housing means and said outlet is provided in said side wall of the housing means.
Claim 5
Dependent Claim
18 words
A filter cartridge according to claim 1, wherein the cylinder means consists of a reinforced borosilicate micro-fibre tube.
Claim 6
Dependent Claim
19 words
A filter cartridge according to claim 1, wherein the cylinder means extends between opposed end walls of the housing.
Claim 7
Dependent Claim
33 words
A filter cartridge according to claim 1, wherein the adsorbent filter medium consists of granules or chips of material selected from the group comprising activated carbon, activated alumina, silica gel and molecular sieve.
Claim 8
Dependent Claim
31 words
A filter cartridge according to claim 1, wherein the oil-soluble dye means includes capsules in the form of chips or granules consisting of a mixture of oil-soluble wax and a dyestuff.
Claim 9
Dependent Claim
26 words
A filter cartridge according to claim 1, wherein the oil-soluble dye means includes capsules which consist of a dyestuff encapsulated within a shell of oil-soluble wax.
Claim 10
Dependent Claim
24 words
A filter cartridge according to claim 1, wherein the oil-soluble dye means includes capsules of a color contrasting with that of the cylinder means.
Claim 11
Dependent Claim
20 words
A filter cartridge according to claim 9, wherein the cylinder means is white and the oil-soluble dye capsules are red.
Claim 12
Dependent Claim
15 words
A filter cartridge according to claim 1, wherein the diffuser means is formed of polyurethane.
Claim 13
Dependent Claim
19 words
A filter cartridge according to claim 1 and wherein said oil-soluble dye means is situated adjacent said diffuser means.
Claim 14
Dependent Claim
31 words
A filter cartridge according to claim 1, wherein said housing means has at said one end region thereof an end wall formed with apertures passing therethrough to provide said fluid inlet.
Claim 15
Dependent Claim
29 words
A filter cartridge according to claim 1, wherein said housing means is opaque and is provided with at least one transparent window through which said cylinder Means is visible.
Claim 16
Dependent Claim
34 words
A filter cartridge according to claim 14, wherein said window is situated adjacent said one end region of said housing means relatively close to said adsorbent medium and the oil-soluble dye means distributed therein.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |