US3768258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polluting fume abatement apparatus
Assignee: CUMMING Corp A CA CORP
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Filing: 1971-05-13
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Granted: 1973-10-30
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Expires: 1991-05-13
Abstract
Abstract Fume abatement apparatus comprises, in combination, A. AN EXHAUST DUCT FOR PASSING A STREAM OF ENGINE PRODUCTS OF COMBUSTION HAVING ELECTRICALLY CHARGEABLE CONTENT, AND B. MEANS INCLUDING AN ION GENERATOR TO EFFECT A FLOW OF IONS INTO SAID STREAM, WITH ION DENSITY AND POLARITY TO SO CHANGE THE ELECTRICAL CHARGE OF SAID CONTENT AS TO ENHANCE SUBSEQUENT PRECIPITATION THEREOF ON A SURFACE.
Inventors
- 👤 H Smith
- 👤 D Saurenman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:19
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/0892; B; B03; B03C; B03C3/00; B03C3/34; B03C3/38; F01N3/01; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
Internal combustion engine exhaust fume abatement apparatus comprising, in combination, a. an exhaust duct for passing a stream of engine products of combustion having electrically chargeable content, b. means including an ion generator comprising multiple pointed tips to effect a flow of ions into said stream, with ion density and polarity to so change the electrical charge of said content as to enhance subsequent precipitation thereof on a surface, c. an insulative shroud for said tips and exposed to said stream in an upstream direction, the shroud extending in protective relation to the tips to prevent direct impingement thereon of the engine products of combustion, and the shroud defining a downstream facing outlet for ions to pass from the tips to the stream path downstream of the tips, and d. the duct having an electrically insulative lining extending from a region upstream of said shroud outlet and at the exterior thereof to a region proximate an outlet to the atmosphere defined by the duct to inhibit neutralization of said ions during their flow in the duct.
Claim 2
Dependent Claim
176 words
Internal combustion engine exhaust fume abatement apparatus comprising, in combination, a. an exhaust duct for passing a stream of engine products of combustion having electrically chargeable content, b. means including an ion generator comprising multiple pointed tips to effect a flow of ions into said stream, with ion density and polarity to so change the electrical charge of said content as to enhance subsequent precipitation thereof on a surface, c. an insulative shroud for said tips and exposed to said stream in an upstream direction, the shroud extending in protective relation to the tips to prevent direct impingement thereon of the engine products of combustion, and the shroud defining a downstream facing outlet for ions to pass from the tips to the stream path downstream of the tips, and d. the duct having an electrically insulative lining extending from a region upstream of said shroud outlet and at the exterior thereof to a region proximate an outlet to the atmosphere defined by the duct to inhibit neutralization of said ions during their flow in the duct.
Claim 3
Dependent Claim
20 words
The combination of claim 1 including an internal combustion engine operatively connected with said duct to supply said stream thereto.
Claim 4
Dependent Claim
18 words
The combination of claim 1 wherein said means includes a high voltage supply electrically connected with said tips.
Claim 5
Dependent Claim
18 words
The combination of claim 1 wherein said tips are exposed to said stream in a downstream direction, only.
Claim 6
Dependent Claim
43 words
The combination of claim 1 where said shroud tapers in an upstream direction and extends in the duct to reduce the duct cross sectional area thereby effecting an increase in the stream velocity past the shroud and tips for mixing with the ions.
Claim 7
Dependent Claim
22 words
The combination of claim 5 including means to pass auxiliary gas to said tips to travel with the ions into the stream.
Claim 8
Dependent Claim
28 words
The combination of claim 1 wherein said ion generator includes a source of positive voltage in excess of +10,000 volts to effect positive ion flow into the stream.
Claim 9
Dependent Claim
26 words
The combination of claim 1 wherein said duct is defined by a vehicle tail pipe with said duct outlet directed toward the ground underlying the vehicle.
References Cited (Backward Citations)
US2037692A
Cited
US3331192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |