John A Ancona

US Patent:

43025080, Nov 24, 1981

Filed:

Sep 12, 1977

Appl. No.:

5/832555

Inventors:

Frank J. Hierholzer - Florissant MO
John A. Ancona - Affton MO
Gerald L. Shelton - St. Louis MO

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

B32B 900

US Classification:

428367

Abstract:

A coherent shape or element of a composition characterized by having a core bonded by regrowth of silicon carbide is produced by heating particulate silicon carbide which may be mixed with a minor amount of modifying agent, by means of an uncharged beam of energy, to a temperature above 3000. degree. F. and below 5500. degree. F. and subsequently cooling the resultant coherent shape below 3000. degree. F. , both steps being completed within a period of ten minutes. In the preferred method, unconsolidated particulate silicon carbide is exposed to the energy of a laser beam and the particulate silicon carbide has a particle size within the range of magnitude of ten to three hundred microns. Upon its initial formation, the shape or element has a core and a distinctly delineated rind which is attached to the core. The core has a relatively low resistivity as compared with the rind.

US Patent:

43285295, May 4, 1982

Filed:

Sep 27, 1979

Appl. No.:

6/079424

Inventors:

Frank J. Hierholzer - Fiorissant MO
John A. Ancona - Affton MO
Gerald L. Shelton - St. Louis MO

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

F23Q 700

US Classification:

361266

Abstract:

An electrical exceptance heater or igniter characterized by having a core bonded by regrowth of silicon carbide is produced by heating particulate silicon carbide which may be mixed with a minor amount of modifying agent, by means of an uncharged beam of energy, to a temperature above 3000. degree. F. and below 5500. degree. F. and subsequently cooling the resultant coherent shape below 3000. degree. F. , both steps being completed within a period of ten minutes. In the preferred method, unconsolidated particulate silicon carbide is exposed to the energy of a laser beam and the particulate silicon carbide has a particulate size within the range of magnitude of ten to three hundred microns. Upon its initial formation, the shape or element has a core and a distinctly delineated rind which is attached to the core. The core has a relatively low resistivity as compared with the rind.

US Patent:

44332335, Feb 21, 1984

Filed:

Oct 23, 1981

Appl. No.:

6/314102

Inventors:

Frank J. Hierholzer - Florissant MO
John A. Ancona - Affton MO
Gerald L. Shelton - St. Louis MO

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

H05B 310

US Classification:

219553

Abstract:

An electrical resistance heater or igniter characterized by having a core bonded by regrowth of silicon carbide is produced by heating particulate silicon carbide which may be mixed with a minor amount of modifying agent, by means of an uncharged beam of energy, to a temperature above 3000. degree. F. and below 5500. degree. F. and subsequently cooling the resultant coherent shape below 3000. degree. F. , both stops being completed within a period of ten minutes. In the preferred method, unconsolidated particulate silicon carbide is exposed to the energy of a laser beam and the particulate silicon carbide has a particle size within the range of magnitude of ten to three hundred microns. Upon its initial formation, the shape or element has a core and a distinctly delineated rind which is attached to the core. The core has a relatively low resistivity as compared with the rind.

US Patent:

41257561, Nov 14, 1978

Filed:

Dec 30, 1976

Appl. No.:

5/755465

Inventors:

Frank J. Hierholzer - Florissant MO
John A. Ancona - Affton MO
Gerald L. Shelton - St. Louis MO

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

B23K 900

US Classification:

219121LM

Abstract:

A coherent shape of a composition characterized by having a core bonded by regrowth of silicon carbide is produced by heating particulate silicon carbide which may be mixed with a minor amount of modifying agent, by means of an uncharged beam of energy, to a temperature above 3000. degree. F. and below 5500. degree. F. and subsequently cooling the resultant coherent shape below 3000. degree. F. , both steps being completed within a period of 10 minutes. In the preferred method, unconsolidated particulate silicon carbide is exposed to the energy of a laser beam and the particulate silicon carbide has a particle size within the range of magnitude of 10 to 300 microns. Upon its initial formation, the shape has a core and a distinctly delineated rind which is attached to the core. The core has a relatively low resistivity as compared with the rind. In an igniter formed by the use of a laser, the rind, which appears to be bonded together by quartz rather than by the regrowth of silicon carbide which characterizes the core, is removed, and the core, formed through at least a part of its reach in a serpentine pattern, is densified.