Patent US4092221A successfully refreshed from Google Patents.
US4092221A
Expired / Lapsed
US
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Apparatus for biologically monitoring air quality
Assignee: Individual
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Filing: 1975-04-10
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Granted: 1978-05-30
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Expires: 1995-04-10
Abstract
Abstract A method and apparatus to indicate air quality and locate sources of air pollution utilizing selected living indicator organisms. Air is drawn through a divided chamber or a series of chambers containing indicator organisms. A comparison is made of the growth and physiological health of the organisms in purified air, i. e., where the particulate matter and chemicals have been removed by a series of filters, and of those organisms in air from which only the particulate matter is removed.
Inventors
- 👤 Harold E. Schlichting, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:54
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N1/2205; G01N1/10; G01N1/2273; Y; Y10; Y10S; Y10S435/00; Y10S435/807; Y10S435/8215; Y10S435/946
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
An apparatus for determining air quality comprising an air tight and water tight chamber consisting of a clear tube divided longitudinally with a control area and an experimental area, both containing test organisms and a series of filters at one end of the chamber through which air passes, said filters in the control area comprising (1) a porous water filter having an extension for attaching to a water reservoir tube on top of said chamber, thereby providing humidity to all sections and to scrub the air of chemicals (2) a membrane filter disc on top of said water filter for removing all particulate matter larger than 0.2 to 1 Mμ from all sections of the chamber, (3) a semi-bonded carbon filter disc on said membrane for removing chemicals from the air and (4) a filter foam disc on said carbon filter disc for removing large particulate matter; said filters in the experimental area comprising the same in the control area except the porous water filter has openings to allow chemicals to enter and there is no carbon filter disc.
Claim 2
Independent Claim
179 words
An apparatus for determining air quality comprising an air tight and water tight chamber consisting of a clear tube divided longitudinally with a control area and an experimental area, both containing test organisms and a series of filters at one end of the chamber through which air passes, said filters in the control area comprising (1) a porous water filter having an extension for attaching to a water reservoir tube on top of said chamber, thereby providing humidity to all sections and to scrub the air of chemicals (2) a membrane filter disc on top of said water filter for removing all particulate matter larger than 0.2 to 1 Mμ from all sections of the chamber, (3) a semi-bonded carbon filter disc on said membrane for removing chemicals from the air and (4) a filter foam disc on said carbon filter disc for removing large particulate matter; said filters in the experimental area comprising the same in the control area except the porous water filter has openings to allow chemicals to enter and there is no carbon filter disc.
References Cited (Backward Citations)
US3741877A
Cited
US3690837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |