US4102201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor sampling and analytical device
Assignee: 3M Co
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Filing: 1977-09-26
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Granted: 1978-07-25
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Expires: 1997-09-26
Abstract
Abstract A device and method for collecting selected components of a fluid mixture such as ambient air are disclosed. A chamber formed by wall members and having an open end contains a layer of collecting material on the bottom thereof and a porous layer covering the open end. After this device has been exposed to the fluid mixture for the prescribed time, a solid cap is placed over the open end of the chamber which facilitates introduction and removal of a elutant for subsequent analysis.
Inventors
- 👤 John A. Trine
- 👤 David L. Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:28
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2273; G01N1/2202; G01N1/2214; G01N1/28; G01N1/40; G01N1/405; G01N2001/2276
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
113 words
A device for sampling and analyzing the amount of at least one selected component of a fluid mixture comprising: a body having wall members defining a chamber having an open end; a collecting layer disposed within said chamber for collecting said selected component; at least one porous attenuating layer supported in said chamber adjacent said open end and covering said open end; a nonporous cap adapted for engagement with said wall members to seal said chamber at said open end; and means in one of said nonporous cap and said wall members for introducing and removing a liquid elutant from said chamber for desorbing said selected component from said detecting layer for analysis.
Claim 2
Independent Claim
113 words
A device for sampling and analyzing the amount of at least one selected component of a fluid mixture comprising: a body having wall members defining a chamber having an open end; a collecting layer disposed within said chamber for collecting said selected component; at least one porous attenuating layer supported in said chamber adjacent said open end and covering said open end; a nonporous cap adapted for engagement with said wall members to seal said chamber at said open end; and means in one of said nonporous cap and said wall members for introducing and removing a liquid elutant from said chamber for desorbing said selected component from said detecting layer for analysis.
Claim 3
Dependent Claim
22 words
The device according to claim 1 wherein said wall members include a base wall opposite said open end and upstanding side walls.
Claim 4
Dependent Claim
16 words
The device according to claim 2 wherein said base wall contains a centrally disposed shallow recess.
Claim 5
Dependent Claim
13 words
The device according to claim 1 wherein said collecting layer comprises activated charcoal.
Claim 6
Dependent Claim
26 words
The device according to claim 1 wherein said porous attenuating layer comprises a plate having channels therethrough and means spacing said plate from said detecting layer.
Claim 7
Dependent Claim
15 words
The device according to claim 1 wherein said porous attenuating layer comprises a microporous membrane.
Claim 8
Dependent Claim
31 words
The device according to claim 2 wherein said nonporous cap comprises a cover plate with an opening and a removable plug for introducing and removing a liquid elutant from said chamber.
Claim 9
Dependent Claim
17 words
The device according to claim 7 wherein said opening aligns with a recess in said base wall.
Claim 10
Dependent Claim
18 words
The device according to claim 7 wherein said nonporous cap contains a pour spout and a removable plug.
Claim 11
Dependent Claim
40 words
The device according to claim 1 wherein said nonporous cap comprises a coverplate having a self-sealing septum therein for penetration by a needle for introducing a liquid elutant into said chamber and venting means for relieving pressure within said chamber.
Claim 12
Dependent Claim
57 words
The device according to claim 10 wherein said venting means comprises a valve structure including a septum resiliently held over an opening in said cap, said septum being movable to an open position when the pressure within said chamber reaches a predetermined pressure allowing the escape of gas through passageways positioned about the periphery of said septum.
Claim 13
Dependent Claim
70 words
The device according to claim 10 wherein said venting means comprises a valve structure including a septum resiliently held, by an elastomeric ring over an annular opening in said cap, said septum being movable to an open position when the pressure within said chamber reaches a predetermined pressure allowing the escape of gas through passageways positioned about the periphery of said septum and extending axially in relationship to said opening.
Claim 14
Dependent Claim
39 words
The device according to claim 2 wherein said side walls have a self-sealing septum therein for penetration by a needle for introducing a liquid elutant into said chamber, said chamber having venting means for relieving pressure within said chamber.
Claim 15
Dependent Claim
90 words
The device according to claim 7 wherein said wall members include a base wall opposite said open end, said base wall having an opening therethrough which is closed by a thin penetratable membrane, and wherein said cover plate has a generally cylindrical hollow needle-like structure integral therewith and communicating with said opening in said cover plate, said needle-like structure terminating at its distal end with a sharpened end disposed in aligned spaced relationship with said opening in the base wall for puncturing said membrane upon flexure of said cover plate.
Claim 16
Independent Claim
125 words
A method of determining the amount of at least one selected component of a fluid mixture comprising the steps of: collecting the selected component by exposing said fluid mixture for a measured period of time to a collecting layer disposed within a chamber formed by body members and having an open end with at least one porous attenuating layer disposed across said open end to allow passage of said fluid into said chamber; sealing said chamber at the expiration of said measured period; adding to said chamber a measured amount on an elutant to desorb the selected component from said collecting layer; withdrawing an aliquot of the elutant containing the selected component; analyzing the solution to determine the amount of the selected component present therein.
Claim 17
Independent Claim
125 words
A method of determining the amount of at least one selected component of a fluid mixture comprising the steps of: collecting the selected component by exposing said fluid mixture for a measured period of time to a collecting layer disposed within a chamber formed by body members and having an open end with at least one porous attenuating layer disposed across said open end to allow passage of said fluid into said chamber; sealing said chamber at the expiration of said measured period; adding to said chamber a measured amount on an elutant to desorb the selected component from said collecting layer; withdrawing an aliquot of the elutant containing the selected component; analyzing the solution to determine the amount of the selected component present therein.
Claim 18
Dependent Claim
30 words
The method according to claim 15 wherein said chamber is sealed by placing a cap over said open end, said cap having means therein for introducing and withdrawing said elutant.
Claim 19
Dependent Claim
26 words
The method according to claim 15 wherein said elutant is added to, and withdrawn from, said chamber through means provided in one of said body members.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |