US5124071A
Expired / Lapsed
US
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Microscopic particles containing imbedded fluorescent dyes and use thereof in particle-image velocimetry
Assignee: Johns Hopkins University
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Filing: 1990-09-20
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Granted: 1992-06-23
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Expires: 2010-09-20
Abstract
Abstract Microscopic, neutrally buoyant particles containing fluorescing compounds used for tracers of large scale turbulent flows. The particles are generated by dissolving acrylics in a solvent and mixing the solution with fluorescing dyes. This mixture is sprayed into a heated chamber where the solvent evaporates, and the solid acrylic with the imbedded dye settles on the bottom of the chamber. The dust is collected, and the particles are separated according to size using a filter. Dye residue on the particles' surface is washed leaving the dye imbedded within the particles. The particles are then used within flow fields.
Inventors
- 👤 Joseph Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:57
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/122; C08K; C08K5/00; C08K5/0008; C08K5/0041; C09; C09B; C09B67/00; C09B67/006; C09B67/0061; C09B67/0097; C09K; C09K11/00; C09K11/06; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
Microscopic particles for use in velocimetry of turbulent flows, comprising: an acrylic resin; and a fluorscent dye imbedded within said acrylic resin; wherein said microscopic particles are substantially spherical, neutrally buoyant and solid; and wherein said dye is uniformly dispersed within said particles.
Claim 2
Dependent Claim
43 words
Microscopic particles for use in velocimetry of turbulent flows, comprising: an acrylic resin; and a fluorscent dye imbedded within said acrylic resin; wherein said microscopic particles are substantially spherical, neutrally buoyant and solid; and wherein said dye is uniformly dispersed within said particles.
Claim 3
Dependent Claim
18 words
Microscopic particles as claimed in claim 1, wherein said microscopic particles have a diameter at least 0.5 μm.
Claim 4
Dependent Claim
24 words
Microscopic particles as claimed in claim 2, wherein said microscopic particles have a diameter in the range of from 10 μm to 30 μm.
Claim 5
Dependent Claim
29 words
Microscopic particles as claimed in claim 3, wherein said dye is selected from the group consisting of Rhodamine 6G, Rhodamine B, DCM 4-(Dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 2,7 Dichlorofluorescein, Fluorescein and combination thereof.
Claim 6
Dependent Claim
15 words
Microscopic particles as claimed in claim 1, wherein said acrylic resin is made from Methacrylate.
Claim 7
Dependent Claim
42 words
Microscopic particles as claimed in claim 5 wherein a grade of Methacrylate used was 2008 and wherein the Methacrylate has a density of 1,196 kg resin/m 3 , a specific gravity of 1.20 at 25° C. and an inherent viscosity of 0.18.
Claim 8
Dependent Claim
76 words
Microscopic particles for use in velocimetry of turbulent flows, comprising: an acrylic resin; and a fluorescent dye imbedded within said acrylic resin; wherein said resin is Methacrylate 2008 and has a density of 1,196 kg resin/m 3 , a specific gravity of 1.20 at 25° C. and an inherent viscosity of 0.18; wherein said particles have a diameter between 10 μm and 30 μm; and wherein said particles are solid and substantially neutrally buoyant in water.
Claim 9
Dependent Claim
76 words
Microscopic particles for use in velocimetry of turbulent flows, comprising: an acrylic resin; and a fluorescent dye imbedded within said acrylic resin; wherein said resin is Methacrylate 2008 and has a density of 1,196 kg resin/m 3 , a specific gravity of 1.20 at 25° C. and an inherent viscosity of 0.18; wherein said particles have a diameter between 10 μm and 30 μm; and wherein said particles are solid and substantially neutrally buoyant in water.
Claim 10
Dependent Claim
35 words
Microscopic particles for use in velocimetry of turbulent flows, as claimed in claim 7: wherein said dye is chosen from the group consisting of Rhodamine 6G, Rhodmaine B, 4-(Dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran, 2,7 Dichlorofluorescein, Fluorescein, and combination thereof.
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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) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |