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US3856550A Expired / Lapsed US ⏱️ 0.0 years remaining

Fluorescent visual augmentation composition

Assignee: United States Department of the Navy
•
Filing: 1973-09-12
•
Granted: 1974-12-24
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Expires: 1993-09-12
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Abstract

Abstract Sized particles of inert carrier material are coated, by means of dry mixing, with smaller particles of daylight fluorescent pigment. The pigment particles adhere tightly to the carrier particles to form a material which is useful in producing signalling and marking clouds.

Inventors

  • 👤 E Bens
  • 👤 L Holt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 11:50
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/22

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 294 words
A METHOD FOR PREPARING COMPOSITE ARTICLES WHICH, WHEN RELEASED IN THE AIR IN A LARGE GROUP, WILL FORM A HIGHLY VISIBLE CLOUD WHICH DESCENDS SLOWLY, SAID METHOD COMPRISING THE STEPS OF: A. PLACING, IN A CONTAINER, A PLURALITY OF INERT DRY CARRIER PARTICLES SELECTED FROM THE GROUP CONSISTING OF TALC, EXPANDED MICA, MAGNESIA, SILICA GEL, DIATOMACEOUS EARTH, BAKELITE, EXPANDED VERMICULITE, CALCIUM SILICATE, ALUMINA AND SILICA, SAID PARTICLES HAVING DIAMETERS SUCH THAT THE PARTICLES WILL PASS THROUGH A SCREEN OF FROM 30 TO 300 MESH; B. ADDING A PLURALITY OF DRY DAYLIGHT FLUORESCENT PIGMENT PARTICLES HAVING DIAMETERS IN THE RANGE OF FROM 0.5 TO 2.5 MICRONS TO SAID CONTAINER WHICH CONTAINS SAID CARRIER PARTICLES, SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES BEING ADDED IN THE WEIGHT PERCENTAGE RANGE OF FROM 12.5 WEIGHT PERCENT PIGMENT PER 87.5 WEIGHT PERCENT CARRIER PARTICLES TO 50 WEIGHT PERCENT PIGMENT PER 50 WEIGHT PERCENT CARRIER PARTICLES; AND SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES BEING PREPARED BY A METHOD SELECTED FROM THAT OF COLORING A RESIN IN TH FUSED STATE WITH A RHODAMINE DYE AND THAT OF DYEING A POWDERED RESIN OR RESIN PRECIPITATE IN A DYEBATH WITH A RHODAMINE DYE AND THEN REDUCING THE COLORED OR DYED RESIN TO PARTICLES HAVING DIAMETERS IN THE RANGE OF FROM 0.5 TO 2.5 MICRONS; AND C. MIXING SAID CARRIER PARTICLES AND SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES TOGETHER UNTIL A PLURALITY OF COMPOSITE ARTICLES EACH MADE UP OF AN INNER CARRIER PARTICLE AND A PLURALITY OF OUTER PIGMENT PARTICLES COATIG THE CARRIER PARTICLES AND HELD THERETO BY MEANS FOR ELECTROSTATIC ATTRACTION, FRICTION FORCES, VAN DER WAALS FORCES, GRAVITATIONAL FORCES OR A COMBINATION THEREOF ARE FORMED AND ALL OF THE MATERIAL IN SAID CONTAINER APPEARS VISUALLY TO HAVE TAKEN ON THE COLOR OF SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES.
Claim 2
Independent Claim 294 words
A METHOD FOR PREPARING COMPOSITE ARTICLES WHICH, WHEN RELEASED IN THE AIR IN A LARGE GROUP, WILL FORM A HIGHLY VISIBLE CLOUD WHICH DESCENDS SLOWLY, SAID METHOD COMPRISING THE STEPS OF: A. PLACING, IN A CONTAINER, A PLURALITY OF INERT DRY CARRIER PARTICLES SELECTED FROM THE GROUP CONSISTING OF TALC, EXPANDED MICA, MAGNESIA, SILICA GEL, DIATOMACEOUS EARTH, BAKELITE, EXPANDED VERMICULITE, CALCIUM SILICATE, ALUMINA AND SILICA, SAID PARTICLES HAVING DIAMETERS SUCH THAT THE PARTICLES WILL PASS THROUGH A SCREEN OF FROM 30 TO 300 MESH; B. ADDING A PLURALITY OF DRY DAYLIGHT FLUORESCENT PIGMENT PARTICLES HAVING DIAMETERS IN THE RANGE OF FROM 0.5 TO 2.5 MICRONS TO SAID CONTAINER WHICH CONTAINS SAID CARRIER PARTICLES, SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES BEING ADDED IN THE WEIGHT PERCENTAGE RANGE OF FROM 12.5 WEIGHT PERCENT PIGMENT PER 87.5 WEIGHT PERCENT CARRIER PARTICLES TO 50 WEIGHT PERCENT PIGMENT PER 50 WEIGHT PERCENT CARRIER PARTICLES; AND SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES BEING PREPARED BY A METHOD SELECTED FROM THAT OF COLORING A RESIN IN TH FUSED STATE WITH A RHODAMINE DYE AND THAT OF DYEING A POWDERED RESIN OR RESIN PRECIPITATE IN A DYEBATH WITH A RHODAMINE DYE AND THEN REDUCING THE COLORED OR DYED RESIN TO PARTICLES HAVING DIAMETERS IN THE RANGE OF FROM 0.5 TO 2.5 MICRONS; AND C. MIXING SAID CARRIER PARTICLES AND SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES TOGETHER UNTIL A PLURALITY OF COMPOSITE ARTICLES EACH MADE UP OF AN INNER CARRIER PARTICLE AND A PLURALITY OF OUTER PIGMENT PARTICLES COATIG THE CARRIER PARTICLES AND HELD THERETO BY MEANS FOR ELECTROSTATIC ATTRACTION, FRICTION FORCES, VAN DER WAALS FORCES, GRAVITATIONAL FORCES OR A COMBINATION THEREOF ARE FORMED AND ALL OF THE MATERIAL IN SAID CONTAINER APPEARS VISUALLY TO HAVE TAKEN ON THE COLOR OF SAID DAYLIGHT FLUORESCENT PIGMENT PARTICLES.
Claim 3
Dependent Claim 22 words
A method according to claim 1 wherein the carrier material is treated with tetrakis (dimethylamino) ethylene prior to adding said pigment particles.

References Cited (Backward Citations)

US2935481A Cited
US3264221A Cited
US3239406A Cited
US3230178A Cited
US3361677A Cited
US3362378A Cited
US3311564A Cited
US3518205A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-23 1978-06-24 1978-12-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-23 1982-06-24 1982-12-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-23 1986-06-24 1986-12-24 $7700.00 Window Closed / Lapsed

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