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US3788545A
Expired / Lapsed
US
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Gas permeation tube and method for the filling thereof
Assignee: Teledyne Monitor Labs Inc
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Filing: 1971-12-27
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Granted: 1974-01-29
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Expires: 1991-12-27
Abstract
Abstract A first permeation tube embodiment has a housing with exterior circular grooves at one end thereof. A gas permeable, Teflon membrane is fitted over the grooved end and an annular retaining ring is then press fitted over the grooved end to create a tortuous seal. An opposite end of the housing contains a needle valve inlet through which a precisely metered volume of gas is introduced by a gas transfer technique. A second permeation tube embodiment includes a container from which liquified gas flows to envelop the exterior surface of a tubular membrane. Air flows through the membrane to dilute gas permeating inwardly through the membrane.
Inventors
- 👤 A Budd
- 👤 R Foster
- 👤 J Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:38
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0006; B; B01; B01F; B01F23/00; B01F23/10; B01F23/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A permeation device comprising: a casing for storing liquid gas therein; an outer end of the casing having grooves therein; a permeation membrane positioned over the grooved end of the casing; and fastener means clamping the membrane against the grooved end of the casing for causing cold flow of membrane material in the grooves and creating a tortuous seal between the membrane and the grooved end of the casing.
Claim 2
Dependent Claim
69 words
A permeation device comprising: a casing for storing liquid gas therein; an outer end of the casing having grooves therein; a permeation membrane positioned over the grooved end of the casing; and fastener means clamping the membrane against the grooved end of the casing for causing cold flow of membrane material in the grooves and creating a tortuous seal between the membrane and the grooved end of the casing.
Claim 3
Dependent Claim
27 words
The structure recited in claim 1 wherein the permeation membrane is cup-shaped and includes a cylindrical wall bounded on one transverse end by a circular integrAl closure.
Claim 4
Dependent Claim
29 words
The structure as set forth in claim 1 wherein the permeation membrane is characterized as test tube shaped with an open end and an oppositely disposed oblong closed end.
Claim 5
Dependent Claim
34 words
The structure as defined in claim 1 wherein the permeation membrane has a hollow tubular shape having opened ends, and further wherein a sealing plug is inserted in an outlet end of the membrane.
Claim 6
Dependent Claim
68 words
A permeation device comprising: a container having liquified gas; a permeation membrane positioned adjacent the container; and conduit means having a diluent passing therethrough, the conduit means communicating between the container and the permeation membrane to channel flow of the liquified gas around the exterior of the membrane; whereby the gas permeates from the outside of the membrane to the inside where it is mixable with the diluent.
Claim 7
Dependent Claim
68 words
A permeation device comprising: a container having liquified gas; a permeation membrane positioned adjacent the container; and conduit means having a diluent passing therethrough, the conduit means communicating between the container and the permeation membrane to channel flow of the liquified gas around the exterior of the membrane; whereby the gas permeates from the outside of the membrane to the inside where it is mixable with the diluent.
Claim 8
Dependent Claim
15 words
The structure of claim 1 wherein the membrane is composed of a polymeric plastic material.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |