Patent US3920402A successfully refreshed from Google Patents.
US3920402A
Expired / Lapsed
US
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Photocolorimetric gas analyzer
Assignee: Individual
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Filing: 1974-05-16
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Granted: 1975-11-18
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Expires: 1994-05-16
Abstract
Abstract A photocolorimetric gas analyzer based on a sensitive element, comprising a radiation source whose electromagnetic radiation is received by the sensitive element which is made in the form of a gas-impermeable tablet containing a selective reagent and an inert filler, which changes the optical properties of its surface layer as a result of the reaction of one of the components of the gas mixture being analyzed and the reagent; a radiation detector to receive the radiation reflected by the surface layer; and means for mechanically removing the latter.
Inventors
- 👤 Nikolai Gavrilovich Afanasiev
- 👤 Valery Leonidovich Zaitsev
- 👤 Vladimir Petrovich Kruglov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A PHOTOCOLORIMETRIC ANALYZER FOR TESTING GAS MIXTURES HAVING SEVERAL COMPONENTS, THE ANALYZER COMPRISING A SENSITIVE ELEMENT MADE IN THE FORM OF A GAS-IMPERMEABLE TABLET CONSISTING OF A MIXTURE OF A SELECTIVE REAGENT AND AN INERT FILLER, AND CHANGING OPTICAL PROPERTIES OF ITS SURFACE LAYER AS A RESULT OF REACTION BETWEEN THE REAGENT AND ONE OF THE COMPONENTS OF THE GAS MIXTURE BEING ANALYZED; MEANS FOR MECHANICALLY REMOVING THE SURFACE LAYER, SAID MEANS BEING MADE IN THE FORM OF A SCRAPER CONTACTING THE SURFACE LAYER; POWER MEANS TO PRODUCE RELATIVE MOVEMENT OF THE SENSITIVE ELEMENT AND THE SCRAPER; A RADIATIO SOURCE LOCATED ON THE SIDE OF THE SURFACE LAYER; A RADIATION DETECTOR TO CONVERT RADIATION REFLECTED FROM THE SURFACE LAYER INTO AN ELECTRICAL SIGNAL; MEANS FOR MEASURING THE LATTER; AND A CONTROL UNIT ELECTRICALLY CONNECTED WITH SAID REMOVING MEANS AND WITH SAID MEASURING MEANS, FOR CONTROLLING SAID LASTNAMED TWO MEANS ACCORDING TO A PRESET PROGRAM.
Claim 2
Dependent Claim
154 words
A PHOTOCOLORIMETRIC ANALYZER FOR TESTING GAS MIXTURES HAVING SEVERAL COMPONENTS, THE ANALYZER COMPRISING A SENSITIVE ELEMENT MADE IN THE FORM OF A GAS-IMPERMEABLE TABLET CONSISTING OF A MIXTURE OF A SELECTIVE REAGENT AND AN INERT FILLER, AND CHANGING OPTICAL PROPERTIES OF ITS SURFACE LAYER AS A RESULT OF REACTION BETWEEN THE REAGENT AND ONE OF THE COMPONENTS OF THE GAS MIXTURE BEING ANALYZED; MEANS FOR MECHANICALLY REMOVING THE SURFACE LAYER, SAID MEANS BEING MADE IN THE FORM OF A SCRAPER CONTACTING THE SURFACE LAYER; POWER MEANS TO PRODUCE RELATIVE MOVEMENT OF THE SENSITIVE ELEMENT AND THE SCRAPER; A RADIATIO SOURCE LOCATED ON THE SIDE OF THE SURFACE LAYER; A RADIATION DETECTOR TO CONVERT RADIATION REFLECTED FROM THE SURFACE LAYER INTO AN ELECTRICAL SIGNAL; MEANS FOR MEASURING THE LATTER; AND A CONTROL UNIT ELECTRICALLY CONNECTED WITH SAID REMOVING MEANS AND WITH SAID MEASURING MEANS, FOR CONTROLLING SAID LASTNAMED TWO MEANS ACCORDING TO A PRESET PROGRAM.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |