Ricardo Pastor

Author:

Ricardo Pastor

ISBN #:

8487265464

US Patent:

45199868, May 28, 1985

Filed:

Jan 28, 1982

Appl. No.:

6/343637

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Remedios K. Chew - Long Beach CA

Assignee:

Hughes Aircraft Company - El Segundo CA

International Classification:

C01F 1500

US Classification:

423 19

Abstract:

The specification discloses a process for the preparation of ultrapure thorium fluoride (ThF. sub. 4) having minimized water content and consequent maximized optical transmission of 10. 6 micrometer radiation. First, thorium oxide is reacted with aqueous hydrofluoric acid to form a solid reaction product, which is then dried under controlled heating to form a hydrated thorium fluoride with a predetermined amount of hydration, namely ThF. sub. 4. xH. sub. 2 O where x is equal to 0. 39. The hydrated thorium fluoride is exposed to a reactive atmosphere of hydrofluoric acid vapor and a selected fluoride compound in the gas phase at elevated temperature for a predetermined period of time. The reactive atmosphere removes substantially all of the water and water-derived impurities from the hydrated thorium fluoride to produce ultrapure thorium fluoride which is highly transmissive to 10. 6 micrometer radiation.

US Patent:

47240385, Feb 9, 1988

Filed:

Jun 2, 1986

Appl. No.:

6/870202

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Luisa E. Gorre - Oxnard CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

B01J 1718

US Classification:

1566202

Abstract:

A method is disclosed for the growth of single crystals of a binary metal oxides of the formula ABO. sub. 3 where A is an alkali or alkaline earth metal, B is at least one element selected from titanium, niobium and tantalum. A mixture comprising the constituent components of the ABO. sub. 3 crystal is prepared using a basic oxide or carbonate of A and a stoichiometric excess of an acidic oxide of B. The mixture is heated at an elevated temperature to form a melt and is thereafter exposed to a reactive atmosphere of a mixture of gaseous carbon monoxide and carbon dioxide. Crystal growth from the melt is effected by a top-seeded crystal pulling technique.

US Patent:

51464683, Sep 8, 1992

Filed:

Dec 14, 1990

Appl. No.:

7/627796

Inventors:

Hiroshi Kimura - Northridge CA
Ricardo C. Pastor - Manhattan Beach CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01S 322

US Classification:

372 59

Abstract:

A high concentration of diatomic molecules is caged in a host crystal by a crystal growth process, in which all other internal degrees of freedom of the diatomic molecule, except the vibrational, are frozen. Such a system provides an efficient mid-infrared, solid-state laser that can be pumped by a laser diode. Other uses include magnetic (Faraday) rotators, electro-optic switches, and Q-switches. The crystal growth process employs Czochralski-type or Bridgman-type processes under high pressure to introduce the diatomic molecule into the host lattice at a temperature slightly above the melting point of the host crystal, followed by slow cooling.

US Patent:

41285891, Dec 5, 1978

Filed:

Jun 22, 1977

Appl. No.:

5/808844

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Morton Robinson - Malibu CA

Assignee:

Hughes Aircraft Company - Culver City CA

International Classification:

C07C 2118

US Classification:

260653

Abstract:

A tetrafluoromethane (CF. sub. 4) generator and process is disclosed that facilitates the relatively low temperature production of CF. sub. 4 gas via controlled decomposition of polytetrafluoroethylene (Teflon) and tetrafluoroethylene (C. sub. 2 F. sub. 4). CF. sub. 4 produced via this process proves to be an excellent OH. sup. - scavenger in the processing and growth of metal fluoride single crystals.

US Patent:

39694917, Jul 13, 1976

Filed:

Aug 18, 1975

Appl. No.:

5/605697

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Arthur J. Timper - Torrance CA

Assignee:

Hughes Aircraft Company - Culver City CA

International Classification:

C01D 314
C01D 320
C01D 304
C01D 310

US Classification:

423499

Abstract:

We have discovered that alkali halides may be purified, particularly of trace anionic and cationic impurities, by scrubbing a melt of the alkali halide with gaseous nascent halogen. The halide radical of the gaseous nascent halogen preferably corresponds to the halide radical of the alkali halide. The purified material may then be used to form single crystals from which laser windows may be produced.

US Patent:

41906403, Feb 26, 1980

Filed:

Dec 4, 1978

Appl. No.:

5/965802

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Antonio C. Pastor - Santa Monica CA

Assignee:

Hughes Aircraft Company - Culver City CA

International Classification:

C01B 710

US Classification:

423500

Abstract:

An improved process for generating nascent bromine through the pyrolytic dissociation of CBr. sub. 4 is shown to be applicable to the growth of large single crystals of metal bromides from the melt.

US Patent:

44656564, Aug 14, 1984

Filed:

Apr 4, 1982

Appl. No.:

6/481592

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Antonio C. Pastor - Santa Monica CA
Luisa E. Gorre - Oxnard CA
Remedios K. Chew - Canoga Park CA

Assignee:

Hughes Aircraft Company - El Segundo CA

International Classification:

C01B 3318
C01G 1702

US Classification:

423339

Abstract:

The specification discloses new and improved processes for forming water-free metal or non-metal oxide materials, which may then be melted and formed into optical components in vitreous or crystal form, which are free of the hydrogen-impurity absorption in the near infrared wavelength range. In one process, a water-free oxide is prepared by reacting a chosen nonpolar compound containing the desired metal or non-metal with an aprotic oxygen-containing compound to form the oxide as a precipitate in a chosen aprotic nonaqueous liquid solvent which provides a water-free environment during the formation of the oxide, to prevent the inclusion of water and water-derived impurities in the oxide as formed. Then the oxide-containing precipitate is subjected to a reactive atmosphere process by exposing the powder to a chosen gas phase reactive atmosphere comprising atomic halogen at a predetermined elevated temperature for a predetermined period of time, to remove traces of water and water-derived impurities from the oxide.

US Patent:

48572934, Aug 15, 1989

Filed:

Oct 15, 1987

Appl. No.:

7/109360

Inventors:

Ricardo C. Pastor - Manhattan Beach CA
Luisa E. Gorre - Oxnard CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

C01B 908
C01G 2116

US Classification:

423489

Abstract:

This invention provides a method for the preparation of ultrapure active metal fluorides of increased purity from their metal oxides by reacting an active metal with a predetermined amount of HF(aq) to form a solid reaction product which is dried under controlled heating to form a hydrated fluoride. This hydrated active metal fluoride is then subjected to reactive atmosphere processing comprising hydrofluoric acid vapor in a CO. sub. 2 reactive carrier gas and a selected halide compound in the gas phase for a predetermined period of time to further increase anion purity.