US3612866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for determining oxygen quantities by measuring oxygen quenching of fluorescent radiation
Assignee: Individual
•
Filing: 1969-07-08
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Granted: 1971-10-12
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Expires: 1989-07-08
Abstract
Abstract Apparatus for measuring oxygen concentration based on oxygen quenching of molecular luminescence; the quenching is evaluated by comparison with an oxygen-shielded reference member in the same environment, using respective photosensitive detectors responding to fluorescence from an unshielded fluorescing member and the reference member.
Inventors
- 👤 Brian Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:17
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N2021/6432; G01N21/75; G01N21/77; G01N2021/7769; G01N2021/7786; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497; Y10T436/209163; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
An oxygen detector comprising a body of luminescent material in which diffusion of molecular oxygen can take place and which can exchange oxygen with its environment at a substantial rate, whereby to quench its luminescence, means to irradiate the body with excitation radiant energy, photosensitive means locAted adjacent the body to receive luminescent radiation therefrom, and means to measure the response of the photosensitive means to said luminescent radiation.
Claim 2
Dependent Claim
69 words
An oxygen detector comprising a body of luminescent material in which diffusion of molecular oxygen can take place and which can exchange oxygen with its environment at a substantial rate, whereby to quench its luminescence, means to irradiate the body with excitation radiant energy, photosensitive means locAted adjacent the body to receive luminescent radiation therefrom, and means to measure the response of the photosensitive means to said luminescent radiation.
Claim 3
Dependent Claim
15 words
The oxygen detector of claim 1, and wherein the luminescent material comprises an aromatic compound.
Claim 4
Dependent Claim
13 words
The oxygen detector of claim 2, and wherein the luminescent material comprises pyrene.
Claim 5
Dependent Claim
21 words
The oxygen detector of claim 1, and wherein the body is in the form of a wafer including oxygen-permeable matrix means.
Claim 6
Dependent Claim
83 words
The oxygen detector of claim 4, and wherein the detector is provided with a reference assembly comprising a similar reference wafer coated with transparent oxygen-impervious shielding material, means to irradiate said reference wafer with excitation radiant energy, additional photosensitive means located to receive luminescent radiation from said reference wafer, and means to measure the response of said additional photosensitive means. , 6. The oxygen detector of claim 1, and wherein the means to irradiate the body comprises an external source of radiant energy.
Claim 7
Dependent Claim
24 words
The oxygen detector of claim 5, and wherein the means to irradiate the wafers comprises a source of radiant energy mounted between the wafers.
Claim 8
Dependent Claim
17 words
The oxygen detector of claim 1, and wherein the means to irradiate the body comprises radioactive material.
Claim 9
Dependent Claim
22 words
The oxygen detector of claim 1, and wherein the means to irradiate the body comprises radioactive material mixed with the luminescent material.
Claim 10
Dependent Claim
43 words
The oxygen detector of claim 5, and wherein the respective photosensitive means are located substantially back-to-back with the wafers located on opposite sides thereof, and wherein the means to irradiate the wafers comprises radioactive material mixed with the luminescent material of the wafers.
References Cited (Backward Citations)
US3285703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |