US3598995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of evaluating ultraviolet radiations and qualitative analysis involving such evaluations
Assignee: Toshiba Corp
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Filing: 1968-08-28
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Granted: 1971-08-10
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Expires: 1988-08-28
Abstract
Abstract Evaluation of wavelengths of ultraviolet radiations is made by irradiating a mixture of two or more specific fluorescent substances, that exhibit different excitation and emission spectra from each other, with ultraviolet rays of unknown wavelengths, identifying distinctive visible colors exhibited by the irradiated mixture and comparing these colors with standard colors which the mixture exhibits when irradiated by ultraviolet rays of known wavelength. Such evaluations are used for the qualitative analysis of sampled materials.
Inventors
- 👤 Masao Inoue
- 👤 Zenzo Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:04
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/8803; G01J; G01J1/00; G01J1/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
50 words
A method as claimed in claim 1 wherein said secondary ultraviolet rays are produced by transmission of said primary ultraviolet radiation through a solution in a solvent of said portion of material and said mixture of fluorescent substances is in the form of a thin layer On a flat substrate.
Claim 2
Dependent Claim
113 words
In a method of quality control analysis in the production of ultraviolet ray-emitting phosphors, the combination of steps of: a. providing a detecting plate coated with a mixture of a plurality of fluorescent substances which exhibit different excitation and emission spectra from each other, b. providing a sample of phosphor to be analyzed, c. irradiating said sample with ultraviolet radiation of short wavelength causing the sample to emit ultraviolet radiation of long wavelength, d. irradiating said detecting plate with said ultraviolet radiation of long wavelength, and e. observing visible light color exhibited by said detecting plate to detect possible abnormal color relative to color normal for phosphor to pass the quality control analysis.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 3 wherein the visible light color in step ''''e'''' is observed through color filters to aid in detecting any significant shift in the long wavelength ultraviolet radiations emitted by the phosphor undergoing quality control analysis.
References Cited (Backward Citations)
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US2346661A
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US3291749A
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US3302023A
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US3320417A
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US3412245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |