US3918939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic precipitator composed of synthetic resin material
Assignee: GEA Group AG
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Filing: 1974-09-03
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Granted: 1975-11-11
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Expires: 1994-09-03
Abstract
Abstract An electrostatic precipitator having a housing and collector plates composed of synthetic resin material in the form of an unsaturated polyester resin or an unsaturated vinyl ester resin with fire retardant additives and containing graphite in an average particle size up to 50 microns and a carbon content of 95 to 99 percent admixed with the resin of the housing walls and the collector plates such that the surface resistance of the collecting electrodes is equal to or less than 104 ohms ( < OR = 104 Omega ) and the surface resistance of the housing is equal to or less than 106 ohms ( < OR = 106 Omega ).
Inventors
- 👤 Lothar Hardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:45
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/02; B; B03; B03C; B03C3/00; B03C3/34; B03C3/40; B03C3/60; B03C3/64; B03C3/82; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
IN AN ELECTROSTATIC PRECIPITATOR COMPRISIN AHOUSING, AT LEAST ONE COLLECTING ELECRODE AND AT LEAST ONE CORONA DISCHARGE ELECTRODE, THE IMPROVEMENT WHEREIN SAID HOUSING IS COMPOSED OF A GLASS-FIBER-REINFORCED UNSATURATED POLYESTER RESIN OR UNSATURATED VINYLESTER RESIN CONTAINING GRAPHITE HAVING AN AVERAGE PARTICLE SIZE UP TO 50 MICRONS AND A CARBON CONTENT OF 95% PERCENT IN SUCH PROPORTIONS THAT THE SURFACE RESISTANCE OF THE HOUSING IS$ 10**6$, SAID COLLECTING ELECTRODE BEING COMPOSED OF A GLASS-FIBER-REINFORCED UNSATURATED POLYESTER RESIN OR UNSATURATED VINYL ESTER RESIN CONTAINING GRAPHITE HAVING AN AVERAGE PARTICLE SIZE UP TO 50 MICRONS AND A CARBON CONTENT OF 95 TO 99 PERCENT IN SUCH PORPORTION THAT THE SURFACE RESISTANCE OF THE COLLECTING ELECTRODE IS $ 10**4$.
Claim 2
Dependent Claim
115 words
IN AN ELECTROSTATIC PRECIPITATOR COMPRISIN AHOUSING, AT LEAST ONE COLLECTING ELECRODE AND AT LEAST ONE CORONA DISCHARGE ELECTRODE, THE IMPROVEMENT WHEREIN SAID HOUSING IS COMPOSED OF A GLASS-FIBER-REINFORCED UNSATURATED POLYESTER RESIN OR UNSATURATED VINYLESTER RESIN CONTAINING GRAPHITE HAVING AN AVERAGE PARTICLE SIZE UP TO 50 MICRONS AND A CARBON CONTENT OF 95% PERCENT IN SUCH PROPORTIONS THAT THE SURFACE RESISTANCE OF THE HOUSING IS$ 10**6$, SAID COLLECTING ELECTRODE BEING COMPOSED OF A GLASS-FIBER-REINFORCED UNSATURATED POLYESTER RESIN OR UNSATURATED VINYL ESTER RESIN CONTAINING GRAPHITE HAVING AN AVERAGE PARTICLE SIZE UP TO 50 MICRONS AND A CARBON CONTENT OF 95 TO 99 PERCENT IN SUCH PORPORTION THAT THE SURFACE RESISTANCE OF THE COLLECTING ELECTRODE IS $ 10**4$.
Claim 3
Dependent Claim
28 words
The improvement defined in claim 1 wherein the polyester resin or vinyl ester resin of the collecting electrode contains graphite in a proportion of 15 to 20 percent.
Claim 4
Dependent Claim
28 words
The electrostatic precipitator defined in claim 1 wherein the polyester resin or vinyl ester resin of said housing contains graphite in a proportion of 8 to 12 percent.
References Cited (Backward Citations)
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |