US3567932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent tracer processes employing a fluorescent europium chelate
Assignee: Individual
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Filing: 1968-03-06
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Granted: 1971-03-02
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Expires: 1988-03-06
Abstract
Abstract An inspection process and inspection tracer compositions which utilize fluorescent coordination compounds dissolved in liquid or resinous carriers. The fluorescent metal-organic coordination compounds provide unique effects of transparency to white light along with novel characteristics of fluorescent color. The tracer compositions disclosed may be utilized for the detection of surface defects in parts, as display elements (image-forming screens), or as marking materials.
Inventors
- 👤 James R Alburger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:46
CPC Classifications
G; G21; G21H; G21H5/00; G21H5/02; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
An inspection process in accordance with claim 1 in which said solvent carrier is at least one member selected from the group consisting of acetone, methylethyl ketone, methyl isobutyl ketone, diacetone alcohol, methanol, ethanol, isopropanol, butanol, isodecanol, diethylene glycol, polyethylene glycol, glycerin, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, polymerized methyl methacrylate, polymerized butyl methacrylate, para-toluene sulfonamide, polystyrene, liquid epoxy resins, cellulose acetate, vinyl plastics, triphenyl phosophate, carnauba wax, beeswax, paraffin, nitroethane, dimethyl sulfoxide, ethyl ether, dioctyl phthalate, N-methyl pyrrolidone, methyl cellosolve acetate, tetrahydrofuran, silicone oils, methylene chloride, trichloroethylene, perchloroethylene, water-insoluble inspection penetrants, water-soluble inspection penetrants, and water-emulsifiable inspection penetrants.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |