US3837808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of analyzing oxygen
Assignee: NGK Insulators Ltd
•
Filing: 1973-02-22
•
Granted: 1974-09-24
•
Expires: 1993-02-22
Abstract
Abstract A method of analyzing oxygen capable of measuring the concentration of oxygen in a sample gas with accuracy and a minimum fluctuation with time, even when said sample gas contains combustible gases together with oxygen, which comprises: DIVIDING THE SAMPLE GAS INTO TWO PARTS; REMOVING OXYGEN FROM THE ONE PART OF THE TWO DIVIDED SAMPLE GAS; ADDING A PREDETERMINED AMOUNT OF OXYGEN OF A KNOWN CONCENTRATION TO THE ONE PART OF THE SAMPLE GAS FROM WHICH OXYGEN HAS BEEN REMOVED AND ANOTHER PART OF THE SAMPLE GAS, RESPECTIVELY; CONVERTING THE OXYGEN CONCENTRATION IN EACH PART OF THE SAMPLE GAS THUS TREATED INTO ELECTROMOTIVE FORCE ELECTROCHEMICALLY BY MEANS OF AN OXYGEN CONCENTRATION CELL COMPRISING A SOLID ELECTROLYTE; AND DETERMINING AND INDICATING THE DIFFERENCE BETWEEN SAID RESPECTIVE ELECTROMOTIVE FORCES.
Inventors
- 👤 I Takeuchi
- 👤 T Sugimoto
- 👤 T Uema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:12
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/417; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497; Y10T436/209163
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
34 words
A method of analyzing oxygen as recited in claim 1, wherein two sets of said steps (c) and (d) are carried out in parallel with each other for each part of the sample gas.
Claim 2
Dependent Claim
47 words
A method of analyzing oxygen as recited in claim 2, wherein said step (b) is carried out in such a way that the sample gas is contacted with a metal whose reaction energy with oxygen is larger than the reaction energy between oxygen and a combustible gas.
Claim 3
Dependent Claim
40 words
A method of analyzing oxygen as recited in claim 3, wherein said metal is fine particles, flakes or a sponge of at least one metal selected from the group consisting of aluminum, calcium, magnesium, lithium, silicon, titanium, zinc and tungsten.
Claim 4
Dependent Claim
42 words
A method of analyzing oxygen as recited in claim 2, wherein said step (c) is carried out in such a way that the sample gas and oxygen of a known concentration are contacted with each other through a quantitative oxygen permeable material.
Claim 5
Dependent Claim
19 words
A method of analyzing oxygen as recited in claim 5, wherein said quantitative oxygen permeable material is a film.
Claim 6
Dependent Claim
36 words
A method of analyzing oxygen as recited in claim 6, wherein said film is made of at least one material selected from the group consisting of silver, silicon rubber, ethylene tetrafluoride resin, natural rubber and polyethylene.
Claim 7
Dependent Claim
26 words
A method of analyzing oxygen as recited in claim 5, wherein said quantitative oxygen permeable material is porous material having numerous interconnected ultra-fine interconnected pores therein.
Claim 8
Dependent Claim
31 words
A method of anaLyzing oxygen as recited in claim 8, wherein said porous material is made of at least one member selected from the group consisting of metals, glass and ceramics.
Claim 9
Dependent Claim
30 words
A method of analyzing oxygen as recited in claim 1, wherein one set of said steps (c) and (d) are carried out alternately for each part of the sample gas.
Claim 10
Dependent Claim
50 words
A method of analyzing oxygen as recited in claim 10, which further comprises: introducing each part of the sample gas into said step (c) alternately therethrough, and storing the electromotive forces into which the oxygen concentration in each part of the sample gas has been converted in said step (d).
Claim 11
Dependent Claim
47 words
A method of analyzing oxygen as recited in claim 10, wherein said step (b) is carried out in such a way that the sample gas is contacted with a metal whose reaction energy with oxygen is larger than the reaction energy between oxygen and a combustible gas.
Claim 12
Dependent Claim
40 words
A method of analyzing oxygen as recited in claim 12, wherein said metal is fine particles, flakes or a sponge of at least one metal selected from the group consisting of aluminum, calcium, magnesium, lithium, silicon, titanium, zinc and tungsten.
Claim 13
Dependent Claim
42 words
A method of analyzing oxygen as recited in claim 10, wherein said step (c) is carried out in such a way that the sample gas and oxygen of a known concentration are contacted with each other through a quantitative oxygen permeable material.
Claim 14
Dependent Claim
19 words
A method of analyzing oxygen as recited in claim 14, wherein said quantitative oxygen permeable material is a film.
Claim 15
Dependent Claim
36 words
A method of analyzing oxygen as recited in claim 15, wherein said film is made of at least one material selected from the group consisting of silver, silicon rubber, ethylene tetrafluoride resin, natural rubber and polyethylene.
Claim 16
Dependent Claim
27 words
A method of analyzing oxygen as recited in claim 14, wherein said quantitative oxygen permeable material is a porous material having numerous interconnected ultra-fine interconnected pores therein.
Claim 17
Dependent Claim
31 words
A method of analyzing oxygen as recited in claim 17, wherein said porous material is made of at least one member selected from the group consisting of metals, glass and ceramics.
Claim 18
Independent Claim
93 words
A method of analyzing oxygen which comprises: a. dividing a sample gas into two parts, b. removing oxygen from the one part of the divided sample gas, c. adding a predetermined amount of oxygen of a known concentration to the one part of the sample gas from which oxygen has been removed, d. converting the oxygen concentration in each part of the sample gas thus treated into electromotive force electrochemically by means of an oxygen concentration cell comprising a solid electrolyte, and e. determining and indicating the difference between said respective electromotive forces.
Claim 19
Dependent Claim
34 words
A method of analyzing oxygen as recited in claim 19, wherein two sets of said steps (c) and (d) are carried out in parallel with each other for each part of the sample gas.
Claim 20
Dependent Claim
30 words
A method for analyzing oxygen as recited in claim 19, wherein one set of said steps (c) and (d) are carried out alternately for each part of the sample gas.
Claim 21
Dependent Claim
50 words
A method for analyzing oxygen as recited in claim 21, which further comprises: introducing each part of the sample gas into said step (c) alternately therethrough, and storing the electromotive forces into which the oxygen concentration in each part of the sample gas has been converted in said step (d).
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |