US4456014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow restrictor
Assignee: Biochem International Inc
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Filing: 1983-01-03
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Granted: 1984-06-26
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Expires: 2003-01-03
Abstract
Abstract For restricting the flow of breathing gas between a patient's breathing tube and a breathing gas analyzer, there is provided a fitting extending into the breathing tube. The fitting preferably has a restricted inlet volume opening through a filter and through a capillary tube into an outlet connectable to the gas analyzer.
Inventors
- 👤 Keith E. Buck
- 👤 Irving C. Chase
- 👤 Marius J. Morin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:29
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/497; A; A61; A61B; A61B5/00; A61B5/08; A61B5/097; A61M; A61M16/00; A61M16/08; A61M16/0816; A61M16/0841; A61M16/085; A61M16/0866; A61M16/10; A61M16/105; A61M16/106; A61M16/1065; A61M2230/00; A61M2230/40; A61M2230/43; A61M2230/432
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A flow restrictor for use with a gas analyzer comprising a conduit adapted to conduct respiration gases; an inlet tube extending within said conduit and defining an inlet volume; an outlet tube forming a junction with said inlet tube; and a capillary tube within said outlet tube, extending substantially to said junction and open at one end to said inlet tube and at the other end to said outlet tube.
Claim 2
Dependent Claim
70 words
A flow restrictor for use with a gas analyzer comprising a conduit adapted to conduct respiration gases; an inlet tube extending within said conduit and defining an inlet volume; an outlet tube forming a junction with said inlet tube; and a capillary tube within said outlet tube, extending substantially to said junction and open at one end to said inlet tube and at the other end to said outlet tube.
Claim 3
Dependent Claim
18 words
A flow restrictor as in claim 1 including a filter in said inlet tube substantially at said junction.
Claim 4
Dependent Claim
25 words
A flow restrictor as in claim 2 including means in said inlet tube for holding said filter against the adjacent end of said capillary tube.
Claim 5
Dependent Claim
14 words
A flow restrictor as in claim 1 in which said capillary tube is glass.
Claim 6
Dependent Claim
111 words
A flow restrictor especially for use with a gas analyzer comprising a conduit having an annular boss in one wall thereof, a bushing fitted into said annular boss, an inlet tube on said bushing extending into said conduit, an inlet passageway extending through said inlet tube and bushing, an outlet tube having one end extending into said bushing in substantial alignment with said inlet passageway and an opposite end adapted to be connected to a gas analyzer, and a capillary tube mounted in said outlet tube adjacent said one end and having a first end in substantial abutment with said bushing and an opposite end in communication with said outlet tube.
Claim 7
Dependent Claim
111 words
A flow restrictor especially for use with a gas analyzer comprising a conduit having an annular boss in one wall thereof, a bushing fitted into said annular boss, an inlet tube on said bushing extending into said conduit, an inlet passageway extending through said inlet tube and bushing, an outlet tube having one end extending into said bushing in substantial alignment with said inlet passageway and an opposite end adapted to be connected to a gas analyzer, and a capillary tube mounted in said outlet tube adjacent said one end and having a first end in substantial abutment with said bushing and an opposite end in communication with said outlet tube.
Claim 8
Dependent Claim
25 words
A flow restrictor as in claim 5 in which said inlet tube has a relatively small volume relative to the volume of said inlet tube.
References Cited (Backward Citations)
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |