US3693410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable air sampling filter cassette
Assignee: ENVIROMENTAL TECHNOLOGIES GROUP Inc
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Filing: 1970-02-02
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Granted: 1972-09-26
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Expires: 1990-02-02
Abstract
Abstract A composite filter unit and cassette to serve as an air sampler for personal use in connection with a metering pump and a cyclone unit. The filter unit is formed of two opposed shells with interfitting flanges to provide a support for the circumferential edges of a filter disc and to form chambers on each side of the disc, one to serve as an inlet and one to serve as an outlet. The chambers are provided with tangential openings so that inlet air is directed parallel to the disc in a toroidal path where it can flow uniformly through the filter disc to the opposed chamber and outlet. The composite filter unit is encapsulated in a cassette during use to protect it against outside contamination, the encapsulator having a special configuration for cooperation with a garment support bracket.
Inventors
- 👤 Charles J Robrecht
- 👤 John S Wyman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:55
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N1/2211; G01N1/2205; G01N2001/222; G01N2001/2223
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
147 words
A method of monitoring and determining the contaminant content of respirable air breathed into the lungs by an individual in a specific environment which comprises: a. providing a filter sheet with an enclosure having an inlet chamber on one side and an outlet chamber on the other side, b. encapsulating the filter sheet enclosure in a capsule having an inlet and outlet to connect to said chamber, c. weighing the enclosure and recording the weight relative to the enclosure, d. placing the capsule and enclosure in a portable air metering circuit and passing respirable air from the vicinity of air to be breathed into the lungs of the wearer through the filter to collect contaminants on the filter sheet for a predetermined period of time, e. removing the enclosure from the capsule, and f. weighing the exposed enclosure to determine the variant weight resulting from the contaminant.
Claim 2
Independent Claim
147 words
A method of monitoring and determining the contaminant content of respirable air breathed into the lungs by an individual in a specific environment which comprises: a. providing a filter sheet with an enclosure having an inlet chamber on one side and an outlet chamber on the other side, b. encapsulating the filter sheet enclosure in a capsule having an inlet and outlet to connect to said chamber, c. weighing the enclosure and recording the weight relative to the enclosure, d. placing the capsule and enclosure in a portable air metering circuit and passing respirable air from the vicinity of air to be breathed into the lungs of the wearer through the filter to collect contaminants on the filter sheet for a predetermined period of time, e. removing the enclosure from the capsule, and f. weighing the exposed enclosure to determine the variant weight resulting from the contaminant.
Claim 3
Dependent Claim
107 words
A contaminant collector for use with an air sampling apparatus which comprises a substantially cylindrical chamber formed of molded parts having a filter sheet disposed in said chamber to divide it into inlet and outlet chambers, said sheet positioned to extend at an acute angle to the general axis of said container to divide the container into respectively inlet and outlet compartments, having a relatively short axial dimension at one sIde and a relatively long axial dimension at the other side, and means forming inlet and outlet passages in said respective chambers positioned in the general vicinity of the largest axial dimension and extending in parallel directions.
Claim 4
Dependent Claim
107 words
A contaminant collector for use with an air sampling apparatus which comprises a substantially cylindrical chamber formed of molded parts having a filter sheet disposed in said chamber to divide it into inlet and outlet chambers, said sheet positioned to extend at an acute angle to the general axis of said container to divide the container into respectively inlet and outlet compartments, having a relatively short axial dimension at one sIde and a relatively long axial dimension at the other side, and means forming inlet and outlet passages in said respective chambers positioned in the general vicinity of the largest axial dimension and extending in parallel directions.
Claim 5
Dependent Claim
26 words
A contaminant collector as defined in claim 2 in which said inlet and outlet passages extend on axes substantially parallel to the plane of said sheet.
Claim 6
Dependent Claim
161 words
A contaminant collector for use with an air sampling apparatus which comprises a substantially cylindrical chamber formed of molded parts having a filter sheet disposed in said chamber to divide it into inlet and outlet chambers, said sheet positioned to extend at an acute angle to the general axis of said container to divide the container into respectively inlet and outlet compartments, having a relatively short axial dimension at one side and a relatively long axial dimension at the other side, means forming inlet and outlet passages in said respective chambers positioned in the general vicinity of the largest axial dimension and extending in parallel directions, a two-part encapsulating container comprising a base for mounting said collector, means on said base to register with and engage in sealing relation with said means forming said inlet and outlet passages of said collector, and a body portion engageable in telescoping relation with said base to enclose said collector when mounted on said base.
Claim 7
Dependent Claim
161 words
A contaminant collector for use with an air sampling apparatus which comprises a substantially cylindrical chamber formed of molded parts having a filter sheet disposed in said chamber to divide it into inlet and outlet chambers, said sheet positioned to extend at an acute angle to the general axis of said container to divide the container into respectively inlet and outlet compartments, having a relatively short axial dimension at one side and a relatively long axial dimension at the other side, means forming inlet and outlet passages in said respective chambers positioned in the general vicinity of the largest axial dimension and extending in parallel directions, a two-part encapsulating container comprising a base for mounting said collector, means on said base to register with and engage in sealing relation with said means forming said inlet and outlet passages of said collector, and a body portion engageable in telescoping relation with said base to enclose said collector when mounted on said base.
Claim 8
Dependent Claim
150 words
A portable apparatus for determining the contaminant content of respirable air which comprises: a. a support means to be mounted on an individual to receive air from a metering device, b. a contaminant collector carried by said support means formed of shells joined at facing rims to provide inlet and outlet chambers, c. means within said collector to support a sheet of filter material between said chambers, d. said inlet and outlet chambers having openings to serve respectively as inlet and outlets for metered air positioned to direct air initially into one of said chambers from said inlet opening in a direction substantially parallel to said sheet of filter material, e. an encapsulating container for said contaminant collector having inlet and outlet openings positioned to interfit with said inlet and outlet, and f. means on said container to facilitate positioning on said support means to be mounted on an individual.
Claim 9
Dependent Claim
150 words
A portable apparatus for determining the contaminant content of respirable air which comprises: a. a support means to be mounted on an individual to receive air from a metering device, b. a contaminant collector carried by said support means formed of shells joined at facing rims to provide inlet and outlet chambers, c. means within said collector to support a sheet of filter material between said chambers, d. said inlet and outlet chambers having openings to serve respectively as inlet and outlets for metered air positioned to direct air initially into one of said chambers from said inlet opening in a direction substantially parallel to said sheet of filter material, e. an encapsulating container for said contaminant collector having inlet and outlet openings positioned to interfit with said inlet and outlet, and f. means on said container to facilitate positioning on said support means to be mounted on an individual.
Claim 10
Dependent Claim
152 words
A portable apparatus for determining the contaminant content of respirable air which comprises: a. a support means to be mounted on an individual to receive air from a metering device, b. a contaminant collector carried by said support means formed of shells joined at facing rims to provide inlet and outlet chambers, c. means within said collector to support a sheet of filter material between said chambers, d. said inlet and outlet chambers having openings to serve respectively as inlet and outlets for metered air positioned to direct air initially into one of said chambers from said inlet opening in a direction substantially parallel to said sheet of filter material, said support means comprising a back plate having fastening means to attach to the garment of a wearer, and e. a plurality of parallel support shelves extending from said back plate, one of said shells being positioned to carry said contaminant collection.
Claim 11
Dependent Claim
152 words
A portable apparatus for determining the contaminant content of respirable air which comprises: a. a support means to be mounted on an individual to receive air from a metering device, b. a contaminant collector carried by said support means formed of shells joined at facing rims to provide inlet and outlet chambers, c. means within said collector to support a sheet of filter material between said chambers, d. said inlet and outlet chambers having openings to serve respectively as inlet and outlets for metered air positioned to direct air initially into one of said chambers from said inlet opening in a direction substantially parallel to said sheet of filter material, said support means comprising a back plate having fastening means to attach to the garment of a wearer, and e. a plurality of parallel support shelves extending from said back plate, one of said shells being positioned to carry said contaminant collection.
Claim 12
Dependent Claim
70 words
An apparatus as defined in claim 5 in which said support means comprises a back plate having at least one shelf extending at right angles to support said container, means on said shelf for receiving air inlet and outlet passages to pneumatically connect with similar passages in said container, and means on said back plate and means on said container to interengage to lock said container on said back plate.
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |