US4605855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analyzer with compact cell structure
Assignee: Horiba Ltd
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Filing: 1984-08-24
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Granted: 1986-08-12
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Expires: 2004-08-24
Abstract
Abstract A gas analyzer has a light source having a window, an open-ended, hollow cylinder aligned with the light source and through which the light from the light source passes, and a detector at the other end of the cell and having a window for receiving the light which has passed through the hollow cylinder. A chopper is provided in the hollow cylinder and is rotatable around an axis perpendicular to the optical path through the hollow cylinder for interrupting the light passing along the optical path. The hollow cylinder has a gas inlet therein at a portion where the optical path for the cell is not screened thereby. The ends of the hollow cylinder are adjacent the light source window and the detector window which serve as cell windows, respectively, at least one of these windows being spaced from the end of the hollow cylinder to define a gap therebetween constituting a gas outlet.
Inventors
- 👤 Takeshi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:27
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/37; G01N21/3504
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
A gas analyzer comprising: a light source having a window; an open-ended, hollow cylinder aligned with said light source and through which the light from said light source passes; a detector at the other end of said cell and having a window for receiving the light which has passed through said hollow cylinder; a chopper in said hollow cylinder and rotatable around an axis perpendicular to the optical path through said hollow cylinder for interrupting the light passing along said optical path; said hollow cylinder having a gas inlet therein at a portion where the optical path for said cell is not blocked thereby; the ends of said hollow cylinder being adjacent the light source window and the detector window which serve as cell windows, respectively, at least one of said windows being spaced from the end of said hollow cylinder to define an annular gap therebetween constituting a gas outlet for causing gas leaving the cell to flow out through the end corner of the cell adjacent said one window.
Claim 2
Dependent Claim
171 words
A gas analyzer comprising: a light source having a window; an open-ended, hollow cylinder aligned with said light source and through which the light from said light source passes; a detector at the other end of said cell and having a window for receiving the light which has passed through said hollow cylinder; a chopper in said hollow cylinder and rotatable around an axis perpendicular to the optical path through said hollow cylinder for interrupting the light passing along said optical path; said hollow cylinder having a gas inlet therein at a portion where the optical path for said cell is not blocked thereby; the ends of said hollow cylinder being adjacent the light source window and the detector window which serve as cell windows, respectively, at least one of said windows being spaced from the end of said hollow cylinder to define an annular gap therebetween constituting a gas outlet for causing gas leaving the cell to flow out through the end corner of the cell adjacent said one window.
Claim 3
Dependent Claim
35 words
A gas analyzer as claimed in claim 1 in which both of said windows are spaced from the respective ends of said hollow cylinder for defining a gap at each end of said hollow cylinder.
Claim 4
Dependent Claim
34 words
A gas analyzer as claimed in claim 1 in which said gap is between said light source window and said hollow cylinder, the other end of said hollow cylinder being sealed to said detector.
Claim 5
Dependent Claim
34 words
A gas analyzer as claimed in claim 1 in which said gap is between said detector window and said hollow cylinder, the other end of said hollow cylinder being sealed to said light source.
Claim 6
Dependent Claim
40 words
A gas analyzer as claimed in claim 4 further comprising a cylindrical member having one end mounted on said detector and spaced from the detector window to define said gap, and the other end being sealed to said hollow cylinder.
Claim 7
Dependent Claim
40 words
A gas analyzer as claimed in claim 3 further comprising a cylindrical member having one end mounted on said detector and spaced from the detector window to define said tap, and the other end being sealed to said hollow cylinder.
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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |