Patent US3680700A successfully refreshed from Google Patents.
US3680700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of precoating a filter cartridge
Assignee: Ecodyne Corp
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Filing: 1970-11-09
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Granted: 1972-08-01
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Expires: 1990-11-09
Abstract
Abstract An improved precoat filter cartridge and a method of applying the precoat medium thereto. The filter cartridge comprises: a vertically extending tubular core element having apertures therein; a filter screen positioned about said core element to receive precoat particles; and a cover member closing off the upper portion of said core element defining a chamber formed by the sides thereof to accumulate gas trapped within said cartridge. A vent hole is provided in said cover member to permit the trapped gas to be vented therethrough.
Inventors
- 👤 Leo F Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:38
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/52; B01D29/11; B01D29/13; B01D29/15; B01D36/00; B01D36/001; B01D37/00; B01D37/02; B01J; B01J47/00; B01J47/12; B01J47/133; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
The method as defined in claim 1 wherein the cycling of said precoat slurry through said tank is effective to increase the pressure of the liquid within said tank and compress said accumulated gas within said chamber.
Claim 2
Dependent Claim
23 words
The method as defined in claim 2 wherein the increased pressure of the liquid within the tank is maintained during the service cycle.
Claim 3
Dependent Claim
26 words
The method as defined in claim 1 including the step of venting the gas compressed within said chamber through an aperture in communication with said chamber.
Claim 4
Dependent Claim
29 words
The method as defined in claim 1 wherein the increased pressure of the liquid within The tank is approximately double the pressure of the liquid initially filling the tank.
References Cited (Backward Citations)
US3178021A
Cited
US3250703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |