US3923462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic detection and integration of light emitted from luminescent reactions
Assignee: SRI International Inc
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Filing: 1974-06-17
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Granted: 1975-12-02
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Expires: 1994-06-17
Abstract
Abstract A low concentration of a substance, e.g., ozone, in a fluid, usually ambient air, is detected and indicated by passing a sample of the fluid through a light-tight enclosure in reacting proximity to a material, e.g., Rhodamine B, which luminesces in the presence of the substance to be detected or a material which normally luminesces (e.g., magnesium oxinate in 3650 Angstrom black light) and is quenched in the presence of the substance to be detected (e.g., hydrogen fluoride). Photographic film is positioned in the enclosure to be exposed to the luminescent reaction of the reactant material and the reacting substance to be detected, whereby exposure of the film indicates presence of a luminescent reaction (including a quenching of luminescence), hence, pressure of the substance to be detected, and film density is a measure of the summation or integral of the amount of the substance present (integral of the light emitted from the luminescent reaction over the time period of exposure).
Inventors
- 👤 Leonard Alan Cavanagh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:42
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/76; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/206664
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
A system for detecting the presence of a given substance in a fluid and providing a means of indicating the amount of the given substance present over a given time period, including: a light-tight enclosure; a material positioned within said enclosure, which material undergoes a luminescent reaction in the presence of the said substance to be detected; photographic film positioned in said enclosure in exposed relation to the said material, whereby the said film is exposed to luminescent emissions; and means for moving the said fluid through the said enclosure in intimate contact with said material, whereby said material undergoes a luminescent reaction with said substance and the said photographic film is exposed to the said luminescent emissions.
Claim 2
Independent Claim
118 words
A system for detecting the presence of a given substance in a fluid and providing a means of indicating the amount of the given substance present over a given time period, including: a light-tight enclosure; a material positioned within said enclosure, which material undergoes a luminescent reaction in the presence of the said substance to be detected; photographic film positioned in said enclosure in exposed relation to the said material, whereby the said film is exposed to luminescent emissions; and means for moving the said fluid through the said enclosure in intimate contact with said material, whereby said material undergoes a luminescent reaction with said substance and the said photographic film is exposed to the said luminescent emissions.
Claim 3
Dependent Claim
20 words
A system as defined in claim 1, wherein an optical step wedge is positioned between said material and said film.
Claim 4
Dependent Claim
24 words
A system as defined in claim 1, wherein said material is one which luminesces in the presence of the said substance to be detected.
Claim 5
Dependent Claim
24 words
A system as defined in claim 2, wherein said material is one which luminesces in the presence of the said substance to be detected.
Claim 6
Dependent Claim
24 words
A system as defined in claim 1, wherein the given substance is ozone and the said material is chemiluminescent in the presence of ozone.
Claim 7
Dependent Claim
14 words
A system as defined in claim 5, wherein the chemiluminescent material is Rhodamine B.
Claim 8
Dependent Claim
42 words
A system as defined in claim 1, wherein said photographic film is contained in a cassette with one frame exposed to said material and means is provided to advance the film from frame to frame, thereby sequentially to expose single subsequent frames.
Claim 9
Dependent Claim
43 words
A system as defined in claim 5, wherein said photographic film is contained in a cassette with one frame exposed to said chemiluminescent material and means is provided to advance the film from frame to frame, thereby sequentially to expose single subsequent frames.
Claim 10
Dependent Claim
43 words
A system as defined in claim 6, wherein said photographic film is contained in a cassette with one frame exposed to said luminescent material and means is provided to advance the film from frame to frame, thereby sequentially to expose single subsequent frames.
Claim 11
Independent Claim
77 words
The method of detecting a light-producing reaction, comprising: positioning a material which produces light in the reaction to be detected in a light-tight enclosure; positioning a photographic film in the said light-tight enclosure adjacent said material, whereby said film is exposed by light from the said reaction of said material; and developing said photographic film thereby to provide an observable indication of its state of exposure and, hence, an indication of the presence of the said reaction.
Claim 12
Independent Claim
77 words
The method of detecting a light-producing reaction, comprising: positioning a material which produces light in the reaction to be detected in a light-tight enclosure; positioning a photographic film in the said light-tight enclosure adjacent said material, whereby said film is exposed by light from the said reaction of said material; and developing said photographic film thereby to provide an observable indication of its state of exposure and, hence, an indication of the presence of the said reaction.
Claim 13
Dependent Claim
26 words
The method defined in claim 10, wherein the light-producing reaction to be detected is chemiluminescence and said material which produces light in the reaction is chemiluminescent.
Claim 14
Independent Claim
112 words
THE METHOD OF DETECTING THE PRESENCE OF A GIVEN SUBSTANCE IN A FLUID AND PRODUCING AN INDICATION OF THE AMOUNT OF THE GIVEN SUBSTANCE PRESENT OVER A GIVEN TIME PERIOD, COMPRISING: POSITIONING A MATERIAL WHICH PRODUCES LIGHT IN THE PRESENCE OF THE SAID SUBSTANCE TO BE DETECTED IN A LIGHT-TIGHT ENCLOSURE; POSITIONING A PHOTOGRAPHIC FILM IN THE SAID ENCLOSURE IN SPACED-APART BUT EXPOSED RELATION WITH RESPECT TO SAID MATERIAL, WHEREBY SAID FILM IS EXPOSED BY LIGHT PRODUCED BY INTERACTION OF SAID SUBSTANCE AND MATERIAL; AND DEVELOPING SAID PHOTOGRAPHIC FILM THEREBY TO PROVIDE AN OBSERVABLE INDICATION OF ITS STATE OF EXPOSURE AND, HENCE, AN INDICATION OF THE AMOUNT OF THE SAID SUBSTANCE PRESENT
Claim 15
Independent Claim
112 words
THE METHOD OF DETECTING THE PRESENCE OF A GIVEN SUBSTANCE IN A FLUID AND PRODUCING AN INDICATION OF THE AMOUNT OF THE GIVEN SUBSTANCE PRESENT OVER A GIVEN TIME PERIOD, COMPRISING: POSITIONING A MATERIAL WHICH PRODUCES LIGHT IN THE PRESENCE OF THE SAID SUBSTANCE TO BE DETECTED IN A LIGHT-TIGHT ENCLOSURE; POSITIONING A PHOTOGRAPHIC FILM IN THE SAID ENCLOSURE IN SPACED-APART BUT EXPOSED RELATION WITH RESPECT TO SAID MATERIAL, WHEREBY SAID FILM IS EXPOSED BY LIGHT PRODUCED BY INTERACTION OF SAID SUBSTANCE AND MATERIAL; AND DEVELOPING SAID PHOTOGRAPHIC FILM THEREBY TO PROVIDE AN OBSERVABLE INDICATION OF ITS STATE OF EXPOSURE AND, HENCE, AN INDICATION OF THE AMOUNT OF THE SAID SUBSTANCE PRESENT
Claim 16
Dependent Claim
48 words
A system as defined in claim 1, wherein said photographic film is contained in a cassette with one frame exposed to said material and means is provided to advance the film in a continuous manner past said luminescent reaction, thereby to provide a continuous monitor of said reaction.
Claim 17
Dependent Claim
49 words
A system as defined in claim 5, wherein said photographic film is contained in a cassette with one frame exposed to said chemiluminescent material and means is provided to advance the film in a continuous manner past said luminescent reaction, thereby to provide a continuous monitor of said reaction.
Claim 18
Dependent Claim
49 words
A system as defined in claim 6, wherein said photographic film is contained in a cassette with one frame exposed to said luminescent material and means is provided to advance the film in a continuous manner past said luminescent reaction, thereby to provide a continuous monitor of said reaction.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |