George H Rodriguez

US Patent:

45741875, Mar 4, 1986

Filed:

Aug 29, 1980

Appl. No.:

6/182548

Inventors:

James E. Crews - North Adams MA
George H. Rodriguez - Williamstown MA

Assignee:

Sprague Electric Company - North Adams MA

International Classification:

H05B 310

US Classification:

219541

Abstract:

A self regulating ceramic PTCR (positive temperature coefficient of resistance) heater has a pair of spaced interdigitated electrodes on one major surface of a ceramic PTCR plate. A heat transfer means is provided for extracting heat from the opposite major surface of the PTCR plate. Best heating efficiency is obtained when the thickness of the PTCR plate is about the same or is less than the average spacing between the electrodes.

US Patent:

40538648, Oct 11, 1977

Filed:

Dec 20, 1976

Appl. No.:

5/752584

Inventors:

George H. Rodriguez - Williamstown MA
John P. Maher - Adams MA

Assignee:

Sprague Electric Company - North Adams MA

International Classification:

H01C 702

US Classification:

338 22SD

Abstract:

A PTCR thermistor has a doped barium titanate body, and two base metal lead wires being bonded to and ohmically connected to two separate surface regions of the body by means of two conductive electrodes, respectively. The electrodes are comprised of aluminum particles being bound within a matrix of a lead borate glass. The glass amounts to from 20 to 60% by weight. The simple method of making the thermistor may include the selective application of heat to the electrode regions to avoid oxidizing the base metal leads. These thermistors are capable of undergoing many self-heating switching operations in service without deterioration of the lead to body connections.

US Patent:

44319835, Feb 14, 1984

Filed:

Nov 19, 1981

Appl. No.:

6/323011

Inventors:

George H. Rodriguez - Williamstown MA

Assignee:

Sprague Electric Company - North Adams MA

International Classification:

H01C 1300

US Classification:

338220

Abstract:

A ceramic PTCR slug has glass-bonded-aluminum layers bonded to the major opposite surfaces. Patches of silver film are bonded to selected regions of the glass-aluminum layers and stainless steel contacts are spring loaded against the silver patches. The stainless steel contacts provide good thermal isolation to the slug. The low cost contacts are complemented by the minumum use of silver in the electrode. The package provides long life under relatively heavy duty service.

US Patent:

43250513, Apr 13, 1982

Filed:

Aug 29, 1980

Appl. No.:

6/182565

Inventors:

George H. Rodriguez - Williamstown MA

Assignee:

Sprague Electric Company - North Adams MA

International Classification:

H01C 1300
H01C 702

US Classification:

338220

Abstract:

A PTCR ceramic slug having glass bonded aluminum electrodes is held firmly sandwiched between opposing inner walls in the cavity of a plastic housing by two identical resilient base-metal pieces on either major face of the slug. Each metal piece has metal fingers making spring loaded contact with the adjacent electroded face of the slug to effect the above noted holding and to form base-metal to base-metal electrical contacts. Each metal piece has at least one portion extending through a hole in the housing to provide electrical access to the PTCR slug.