Patent US3700330A successfully refreshed from Google Patents.
US3700330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical vehicle exhaust particulate monitor
Assignee: Motors Liquidation Co
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Filing: 1971-10-13
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Granted: 1972-10-24
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Expires: 1991-10-13
Abstract
Abstract A device for measuring the particulates entrained in a gaseous stream includes a rotating transparent cylinder through which the gases pass, a supply of dry ionized air for admixture with the gaseous stream to charge the particles entrained in the stream and a pair of electrodes adjacent the rotating cylinder for establishing an electrostatic field to precipitate the particles onto the cylinder wall. An optical scanning device then measures the collected particulate according to the attenuation of light beams passing through the cylinder wall.
Inventors
- 👤 Roger C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:07
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/06; G01N15/0606; G01N15/0618; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
An apparatus for measuring particulate matter entrained in a gaseous stream comprising a rotatable transparent cylinder, means for rotating the cylinder, means for passing at least a portion of the gaseous stream through the cylinder, means for electrically charging the particulate matter, means for establishing an electriCal field for precipitating the particulate matter onto the cylinder wall so that the particulate accumulation therein is a function of the amount of particulate matter in the gaseous stream, and optical means including at least one light beam source for scanning the cylinder wall and photoelectrical detector means responsive to the light thereon for producing an electrical output in accordance with the beam intensity whereby the particulate accumulation attenuates the light beam and the output signal according to the amount of particulate matter entrained in the gaseous stream.
Claim 2
Independent Claim
135 words
An apparatus for measuring particulate matter entrained in a gaseous stream comprising a rotatable transparent cylinder, means for rotating the cylinder, means for passing at least a portion of the gaseous stream through the cylinder, means for electrically charging the particulate matter, means for establishing an electriCal field for precipitating the particulate matter onto the cylinder wall so that the particulate accumulation therein is a function of the amount of particulate matter in the gaseous stream, and optical means including at least one light beam source for scanning the cylinder wall and photoelectrical detector means responsive to the light thereon for producing an electrical output in accordance with the beam intensity whereby the particulate accumulation attenuates the light beam and the output signal according to the amount of particulate matter entrained in the gaseous stream.
Claim 3
Independent Claim
176 words
An apparatus for measuring particulate matter entrained in a gaseous stream comprising a rotatable transparent cylinder, means for rotating the cylinder, means for passing at least a portion of the gaseous stream through the cylinder, means for electrically charging the particulate matter, a pair of spaced stationary substantially semicylindrical electrodes disposed adjacent opposite sides of the cylinder and defining a pair of longitudinal gaps therebetween, a high voltage source connected across the electrodes for establishing an electrical field for precipitating the particulate matter onto the cylinder wall so that the particulate accumulation thereon is a function of the amount of particulate matter in the gaseous stream, and optical means including at least one light beam source directed through the gaps and through the cylinder for scanning the cylinder wall during cylinder rotation and photoelectric detector means responsive to the light beam for producing an electrical output in accordance with the beam intensity whereby the particulate accumulation attenuates the light beam and the output signal according to the amount of particulate matter entrained in the gaseous stream.
Claim 4
Independent Claim
176 words
An apparatus for measuring particulate matter entrained in a gaseous stream comprising a rotatable transparent cylinder, means for rotating the cylinder, means for passing at least a portion of the gaseous stream through the cylinder, means for electrically charging the particulate matter, a pair of spaced stationary substantially semicylindrical electrodes disposed adjacent opposite sides of the cylinder and defining a pair of longitudinal gaps therebetween, a high voltage source connected across the electrodes for establishing an electrical field for precipitating the particulate matter onto the cylinder wall so that the particulate accumulation thereon is a function of the amount of particulate matter in the gaseous stream, and optical means including at least one light beam source directed through the gaps and through the cylinder for scanning the cylinder wall during cylinder rotation and photoelectric detector means responsive to the light beam for producing an electrical output in accordance with the beam intensity whereby the particulate accumulation attenuates the light beam and the output signal according to the amount of particulate matter entrained in the gaseous stream.
Claim 5
Independent Claim
226 words
An apparatus for measuring particulate matter entrained in a gaseous stream comprising a rotatable transparent cylinder, means for rotating the cylinder, means for passing at least a portion of the gaseous stream through the cylinder, means for diluting the gaseous stream portion including a source of dilutant gas for supplying dilutant gas to the cylinder, means for electrically charging the particulate matter including means for ionizing the dilutant gas whereby the particulate matter becomes charged by associating with the ionized dilutant gas, a pair of spaced stationary substantially semicylindrical electrodes disposed adjacent opposite sides of the cylinder and defining a pair of longitudinal gaps therebetween, a high voltage source connected across the electrodes for establishing an electrical field for precipitating the particulate matter onto the cylinder wall so that the particulate accumulation thereon is a function of the amount of particulate matter in the gaseous stream, and optical means including a source of a plurality of light beams directed through the gaps and through the cylinder for scanning the cylinder wall during cylinder rotation and a plurality of photoelectric detectors each responsive to one of the light beams for producing in combination an electrical output signal in accordance with the beam intensity whereby the particulate accumulation attentuates the light beams and the output signal according to the amount of particulate matter entrained in the gaseous stream.
Claim 6
Independent Claim
226 words
An apparatus for measuring particulate matter entrained in a gaseous stream comprising a rotatable transparent cylinder, means for rotating the cylinder, means for passing at least a portion of the gaseous stream through the cylinder, means for diluting the gaseous stream portion including a source of dilutant gas for supplying dilutant gas to the cylinder, means for electrically charging the particulate matter including means for ionizing the dilutant gas whereby the particulate matter becomes charged by associating with the ionized dilutant gas, a pair of spaced stationary substantially semicylindrical electrodes disposed adjacent opposite sides of the cylinder and defining a pair of longitudinal gaps therebetween, a high voltage source connected across the electrodes for establishing an electrical field for precipitating the particulate matter onto the cylinder wall so that the particulate accumulation thereon is a function of the amount of particulate matter in the gaseous stream, and optical means including a source of a plurality of light beams directed through the gaps and through the cylinder for scanning the cylinder wall during cylinder rotation and a plurality of photoelectric detectors each responsive to one of the light beams for producing in combination an electrical output signal in accordance with the beam intensity whereby the particulate accumulation attentuates the light beams and the output signal according to the amount of particulate matter entrained in the gaseous stream.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |