Patent · US Active

Temperature limited heaters with high power factors

US8355623B2 · kind B2 · utility

68Cited by

806References

46Claims

0Family size

Assignee

SHELL OIL COMPNY · US

Inventors

Harold J. Vinegar · Houston, US
Christopher Harris · Täby, SE
Chester Ledlie Sandberg · Los Altos, US

Key dates

Filing date	Apr 22, 2005
Grant date	Jan 15, 2013
Priority date	—
Expiry date	Oct 2, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH05B3/141
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

Certain embodiments provide a heater. The heater includes a ferromagnetic member. The heater also includes an electrical conductor electrically coupled to the ferromagnetic member. The electrical conductor is configured to conduct a majority of time-varying electrical current passing through the heater at about 25° C. The heater is configured to provide a first heat output below the Curie temperature of the ferromagnetic member. The heater is configured to automatically provide a second heat output approximately at and above the Curie temperature of the ferromagnetic member. The second heat output is reduced compared to the first heat output.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.