Michael S Colvin

US Patent:

48731021, Oct 10, 1989

Filed:

Mar 14, 1988

Appl. No.:

7/167723

Inventors:

Manchium Chang - Los Angeles CA
Michael S. Colvin - Malibu CA

International Classification:

B05D 512

US Classification:

427130

Abstract:

Magnetic polymer particles are formed by swelling porous, polymer particles and impregnating the particles with an aqueous solution of precursor magnetic metal salt such as an equimolar mixture of ferrous chloride and ferric chloride. On addition of a basic reagent such as dilute sodium hydroxide, the metal salts are converted to crystals of magnetite which are uniformly contained througout the pores of the polymer particle. The magnetite content can be increased and neutral buoyancy achieved by repetition of the impregnaton and neutralization steps to adjust the magnetite content to a desired level.

US Patent:

49816250, Jan 1, 1991

Filed:

Mar 14, 1988

Appl. No.:

7/167877

Inventors:

Won-Kyu Rhim - Pasadena CA
Michael T. Hyson - Glendale CA
Michael S. Colvin - Malibu CA
Manchium Chang - Los Angeles CA

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

B28B 910
B29C 3500

US Classification:

264 13

Abstract:

Monodisperse, polymeric microspheres are formed by injecting uniformly shaped droplets of radiation polymerizable monomers, preferably a biocompatible monomer, having covalent binding sites such as hydroxyethylmethacrylate, into a zone, impressing a like charge on the droplet so that they mutually repel each other, spheroidizing the droplets within the zone and collecting the droplets in a pool of cryogenic liquid. As the droplets enter the liquid, they freeze into solid, glassy microspheres, which vaporizes a portion of the cryogenic liquid to form a layer. The like-charged microspheres, suspended within the layer, move to the edge of the vessel holding the pool, are discharged, fall and are collected. The collected microspheres are irradiated while frozen in the cryogenic liquid to form latent free radicals. The frozen microspheres are then slowly thawed to activate the free radicals which polymerize the monomer to form evenly-sized, evenly-shaped, monodisperse polymeric microspheres.

US Patent:

47075236, Nov 17, 1987

Filed:

Oct 11, 1985

Appl. No.:

6/786649

Inventors:

Manchium Chang - Los Angeles CA
Michael S. Colvin - Malibu CA
Alan Rembaum - Pasadena CA
Gil F. Richards - Duarte CA

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

C02F 842

US Classification:

525372

Abstract:

Metal oxide containing polymers and particularly styrene, acrylic or protein polymers containing fine, magnetic iron oxide particles are formed by combining a NO. sub. 2 -substituted polymer with an acid such as hydrochloric acid in the presence of metal, particularly iron particles. The iron is oxidized to fine, black Fe. sub. 3 O. sub. 4 particles which deposit selectively on the polymer particles. Nitrated polymers are formed by reacting functionally substituted, nitrated organic compounds such as trinitrobenzene sulfonate or dinitrofluoro benzene with a functionally coreactive polymer such as an amine modified acrylic polymer or a protein. Other transition metals such as cobalt can also be incorporated into polymers using this method.

Address:

812 Paseo Cerro Pl, Las Vegas, NV 89138

VIN:

1FMFU205X7LA37177

Make:

FORD

Model:

EXPEDITION

Year:

2007