Inductor devices – With outer casing or housing
Reexamination Certificate
2000-04-20
2002-09-24
Donovan, Lincoln (Department: 2832)
Inductor devices
With outer casing or housing
C336S192000, C336S229000
Reexamination Certificate
active
06456180
ABSTRACT:
BACKGROUND OF THE INVENTION
In order to meet international safety agencies' standards for transformers connected to a telephone line, three things are required:
1. Supplementary Insulation between the winding connected to the phone line and all other windings and the core. Supplementary means two independent insulation layers in order to ensure protection against electrical shock, and is referred to herein as Requirement No. 1.
2. Clearance distance which is a minimum of 2.0 mm. Clearance distance is the shortest distance between two conductive parts, or between a conductive part and the bounding surface of the equipment, measured through air, and is referred to herein as Requirement No. 2.
3. Creepage distance which is a minimum of 2.5 mm. Creepage distance is the shortest path between two conductive parts, or between a conductive part and the bounding surface of the equipment, measured along the surface of the isolation, and is referred to herein as Requirement No. 3.
In addition to the safety agency requirements, it is also desirable to keep the device as small as possible so as to reduce the required printed circuit board area to an absolute minimum. This is referred to herein as Requirement No. 4.
OBJECT OF THE INVENTION
The object of the invention is to provide a line interface transformer which meets the foregoing safety requirements while minimizing the size of the transformer.
Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.
REFERENCES:
patent: 4656395 (1987-04-01), Fahnrich et al.
patent: 5656985 (1997-08-01), Lu et al.
patent: 6031442 (2000-02-01), Nakazawa
Bel-Fuse Inc.
Donovan Lincoln
Nguyen Tayler T.
Ostrolenk Faber Gerb & Soffen, LLP
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