US4147521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid washed montmorillonite clays for improving electrostatic precipitation of dust particles
Assignee: ChampionX LLC
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Filing: 1977-12-15
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Granted: 1979-04-03
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Expires: 1997-12-15
Abstract
Abstract A method for the electrostatic precipitation of dust particles entrained in a gas stream which comprises adding predetermined amounts of acid washed montmorillonite clays into the particle-laden gas stream in a location preceding the precipitation apparatus where the gas is at an elevated temperature.
Inventors
- 👤 Vincent M. Albanese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:52
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/013
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
A method of improving the conductivity of particles entrained in a stream of particle-laden gas formed by the burning of coal, which particles are collected by an electrostatic precipitator which comprises treating said gas containing particles prior to contact with the electrostatic precipitator at a temperature not greater than about 1800° F. with a resistivity-decreasing amount of acid washed montmorillonite clay and thereafter passing the gas to the electrostatic precipitator.
Claim 2
Independent Claim
70 words
A method of improving the conductivity of particles entrained in a stream of particle-laden gas formed by the burning of coal, which particles are collected by an electrostatic precipitator which comprises treating said gas containing particles prior to contact with the electrostatic precipitator at a temperature not greater than about 1800° F. with a resistivity-decreasing amount of acid washed montmorillonite clay and thereafter passing the gas to the electrostatic precipitator.
Claim 3
Dependent Claim
16 words
The method of claim 1 where the acid washed montmorillonite clay is an acid washed bentonite.
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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |