In one embodiment, a potassium-doped waveguide is buried by a thin sodium-doped layer.

A sheet product is provided which comprises a scrim (1 and 2) embedded in a continuous layer of a foamed resin (3).

A LCD display (130) is embedded within a transparent or translucent polymeric layer (132) in the housing (110).

The external electrodes (4a, 4b) of a chip component (3) embedded in an insulating layer (2) have extended portions (42) on the top surface.

In a second embodiment, the conductive current mask (48) is totally embedded within a lightly doped layer (44) that is grown proximate to the active region.

A controller for regulating the temperature of the heating unit can be incorporated into a heating source connected to the heating unit, or embedded into a heating element layer of the unit.

The casing (3) is formed in one piece from insulating material, and has at least one sunken seat (12a) housing the electronic circuit (4), which is embedded in a layer of insulating silicone resin (40) poured and set inside the sunken seat.

The bonding layer includes a mesh embedded in an adhesive material.

It also comprises a lower end including a strainer (16) embedded in said bottom layer (29).

The heating mechanism can be at least one of a conductive polymeric layer, a heating element embedded in the polymeric layer, or a heating jacket.

A nonwoven cloth (131) is embedded into the adhesive layer (130).

In the prepreg, the carrier and an insulating resin layer having a fiber cloth embedded therein are laminated.

In one embodiment, a potassium-doped waveguide is buried by a thin sodium-doped layer.

The outer main brown layer can include a fiberglass mesh embedded into the outer main brown layer.

The opening (18), for the embedded device, is enlarged in an intermediate layer (10) to enhance flexibility of the flexible circuit assembly.