Patent US5341336A successfully refreshed from Google Patents.
US3715033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge
Assignee: Ecodyne Corp
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Filing: 1970-11-09
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Granted: 1973-02-06
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Expires: 1990-11-09
Abstract
Abstract A precoat filter cartridge for removing impurites from a liquid, comprising: a rigid tubular core element having holes therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element; a layer of course screen wrapped about said core element; and a layer of fine mesh screen wrapped about said layer of course screen.
Inventors
- 👤 A Soriente
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:28
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D37/00; B01D37/02; B01J; B01J47/00; B01J47/12; B01J47/133; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0453
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A precoat filter cartridge for removing impurities from a liquid, comprising: a. a rigid tubular core element having holes formed therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element so as to increase the pressure drop across said core element and thereby cause precoat material to flow upward towards the top of said cartridge; b. a layer of coarse screen wrapped about said core element; and c. a layer of fine mesh screen wrapped about said layer of coarse screen.
Claim 2
Dependent Claim
95 words
A precoat filter cartridge for removing impurities from a liquid, comprising: a. a rigid tubular core element having holes formed therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element so as to increase the pressure drop across said core element and thereby cause precoat material to flow upward towards the top of said cartridge; b. a layer of coarse screen wrapped about said core element; and c. a layer of fine mesh screen wrapped about said layer of coarse screen.
Claim 3
Dependent Claim
95 words
A precoat filter cartridge for removing impurities from a liquid, comprising: a. a rigid tubular core element having holes formed therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element so as to increase the pressure drop across said core element and thereby cause precoat material to flow upward towards the top of said cartridge; b. a layer of coarse screen wrapped about said core element; and c. a layer of fine mesh screen wrapped about said layer of coarse screen.
Claim 4
Dependent Claim
95 words
A precoat filter cartridge for removing impurities from a liquid, comprising: a. a rigid tubular core element having holes formed therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element so as to increase the pressure drop across said core element and thereby cause precoat material to flow upward towards the top of said cartridge; b. a layer of coarse screen wrapped about said core element; and c. a layer of fine mesh screen wrapped about said layer of coarse screen.
Claim 5
Dependent Claim
111 words
A precoat filter cartridge for removing impurities from a liquid, comprising: a. a rigid tubular core element having holes formed therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element so as to increase the pressure drop across said core element and thereby cause precoaT material to flow upwards towards the top of said cartridge; b. a layer of coarse screen having openings in the size range of 6 to 10 mesh wrapped about said core element; and c. a layer of fine mesh screen approximately 50 X 250 mesh wrapped about said layer of coarse screen.
Claim 6
Dependent Claim
111 words
A precoat filter cartridge for removing impurities from a liquid, comprising: a. a rigid tubular core element having holes formed therein, said holes having a total area in the range of 3 to 9 percent of the total surface area of said core element so as to increase the pressure drop across said core element and thereby cause precoaT material to flow upwards towards the top of said cartridge; b. a layer of coarse screen having openings in the size range of 6 to 10 mesh wrapped about said core element; and c. a layer of fine mesh screen approximately 50 X 250 mesh wrapped about said layer of coarse screen.
Claim 7
Dependent Claim
23 words
In the filter cartridge of claim 2 wherein said fine mesh screen has particle retension openings of 0.002 inch + or -0.0005 inch.
References Cited (Backward Citations)
US2047793A
Cited
US3422958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |