US4256964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analyzer
Assignee: Horiba Ltd
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Filing: 1978-12-22
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Granted: 1981-03-17
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Expires: 1998-12-22
Abstract
Abstract A gas analyzer includes a first conduit for the supply of gas to be tested, a second conduit for the supply of a standard gas, first and second cells, a light source for directing light rays through the first and second cells, and a detector for receiving the light rays after passing through the cells. There is provided a gas flow change-over device connected to the first and second conduits for alternating at fixed intervals between a first gas supply arrangement wherein fixed amounts of gas to be tested and the standard gas are simultaneously supplied to the first and second cells, respectively, and a second gas supply arrangement wherein the fixed amounts of the gas to be tested and the standard gas are simultaneously supplied to the second and first cells, respectively.
Inventors
- 👤 Kozo Ishida
- 👤 Osamu Saitoh
- 👤 Takao Imaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:00
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/37
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A gas analyzer comprising: a first conduit for the supply of a gas to be tested; a second conduit for the supply of a standard gas; a first cell; a second cell; gas flow path change-over means, connected to said first and second conduits, for alternating at fixed intervals between a first gas supply arrangement wherein fixed amounts of said gas to be tested and said standard gas are simultaneously supplied to said first and second cells, respectively, and a second gas supply arrangement wherein said fixed amounts of said gas to be tested and said standard gas are simultaneously supplied to said second and first cells, respectively;
Claim 2
Dependent Claim
108 words
A gas analyzer comprising: a first conduit for the supply of a gas to be tested; a second conduit for the supply of a standard gas; a first cell; a second cell; gas flow path change-over means, connected to said first and second conduits, for alternating at fixed intervals between a first gas supply arrangement wherein fixed amounts of said gas to be tested and said standard gas are simultaneously supplied to said first and second cells, respectively, and a second gas supply arrangement wherein said fixed amounts of said gas to be tested and said standard gas are simultaneously supplied to said second and first cells, respectively;
Claim 3
Dependent Claim
26 words
light source means for directing light rays through said first and second cells; and detector means for receiving said light rays after passing through said cells.
Claim 4
Dependent Claim
26 words
light source means for directing light rays through said first and second cells; and detector means for receiving said light rays after passing through said cells.
Claim 5
Dependent Claim
106 words
A gas analyzer as claimed in claim 1, wherein said first conduit comprises upstream and downstream portions, said second conduit comprises upstream and downstream portions, said downstream portion of said first conduit is connected to said first cell, and said downstream portion of said second conduit is connected to said second cell, and wherein said changeover means comprises first and second valves between said upstream and downstream portions of said first and second conduits, respectively, a third conduit connecting said second valve and said downstream portion of said first conduit, and a fourth conduit connecting said first valve and said downstream portion of said second conduit.
Claim 6
Dependent Claim
21 words
A gas analyzer as claimed in claim 2, wherein each of said first and second valves comprises a three-way electromagnetic valve.
Claim 7
Dependent Claim
68 words
A gas analyzer as claimed in claim 1, wherein each of said first and second cells is divided into plural chambers by windows through which said light rays pass, the odd-numbered said chambers of said first cell being connected to the even-numbered said chambers of said second cell, and the odd-numbered said chambers of said second cell being connected to the even-numbered said chambers of said first cell.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |