US3966434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for filtering gas and cleaning of filter bags
Assignee: Phillips Petroleum Co
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Filing: 1974-10-21
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Granted: 1976-06-29
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Expires: 1994-10-21
Abstract
Abstract A process for removing solids from a stream of gas comprising passing a solids-laden gas through a woven fabric filter bag, which bag is installed with longitudinal slack, wherein, during filtration, the differential pressure across the bag causes the bag to expand outwardly. During clean-off, the exhaust valve of the apparatus is closed and, as the differential pressure across the bag approaches zero, the bag becomes slack and the solids deposited on the filter surface disengage therefrom and drop, by gravity flow, to a collection bin. The exhaust valve is then opened and the step of removing solids from the gas stream is resumed.
Inventors
- 👤 Arthur E. Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:07
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/74; B01D46/76
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
170 words
A process for removing suspended solids from a stream of gas comprising passing a solids-laden gas stream through a filter bag in a bag filter compartment, wherein said bag is fabricated from a polytetrafluoroethylene woven fabric wherein said bag is heat-stabilized, and wherein said filter bag is mounted in said filter compartment with 0.5 to 5 percent longitudinal slack, based upon the bag length when there is no differential pressure across said bag and wherein during filtration the differential pressure across said bag removes said slack by causing said bag to expand, collecting clean gas in a closed compartment enclosing said filter bag, exhausting said clean gas via an open exhaust valve, closing said exhaust valve whereby when said exhaust valve is closed, the differential pressure across said bag approaches zero, said bag becomes slack and the solids deposited on the filter surface disengage therefrom and fall to collection chamber, after which, said exhaust valve is opened and the step of removing solids from said stream of gas is resumed.
Claim 2
Dependent Claim
170 words
A process for removing suspended solids from a stream of gas comprising passing a solids-laden gas stream through a filter bag in a bag filter compartment, wherein said bag is fabricated from a polytetrafluoroethylene woven fabric wherein said bag is heat-stabilized, and wherein said filter bag is mounted in said filter compartment with 0.5 to 5 percent longitudinal slack, based upon the bag length when there is no differential pressure across said bag and wherein during filtration the differential pressure across said bag removes said slack by causing said bag to expand, collecting clean gas in a closed compartment enclosing said filter bag, exhausting said clean gas via an open exhaust valve, closing said exhaust valve whereby when said exhaust valve is closed, the differential pressure across said bag approaches zero, said bag becomes slack and the solids deposited on the filter surface disengage therefrom and fall to collection chamber, after which, said exhaust valve is opened and the step of removing solids from said stream of gas is resumed.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said solids-laden stream is a carbon-black smoke.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |