Abstract: A method is provided for forming isolated regions of oxide of an integrated circuit, and an integrated circuit formed according to the same. A pad oxide layer is formed over the integrated circuit. A nitrogen doped polysilicon layer is formed over the pad oxide layer. A thick nitride layer is then formed over the nitrogen doped polysilicon layer. An opening is formed in the nitride layer and the nitrogen doped polysilicon layer exposing a portion of the pad oxide layer. The nitrogen doped polysilicon layer is annealed encapsulating the polysilicon layer in silicon nitride. A field oxide region is then formed in the opening.

Abstract: A method is provided for forming isolated regions of oxide of an integrated circuit, and an integrated circuit formed according to the same. A pad oxide layer is formed over the integrated circuit. A nitrogen doped polysilicon layer is formed over the pad oxide layer. A thick nitride layer is then formed over the nitrogen doped polysilicon layer. An opening is formed in the nitride layer and the nitrogen doped polysilicon layer exposing a portion of the pad oxide layer. The nitrogen doped polysilicon layer is annealed encapsulating the polysilicon layer in silicon nitride. A field oxide region is then formed in the opening.

Abstract: This invention relates to apparatus for elevating a mobile workover rig to an elevated operating position proximate wellhead. It includes a portable platform arranged for positioning proximate the wellhead with the platform having a fixed generally horizontal upper surface portion for receiving and supporting the wheels of the rig thereon. It also includes ram means comprising two longitudinally aligned portions connected to the platform for forming an inclined ramp extending from the upper surface of the platform to the ground for moving the rig thereonto. It also includes means connected to the ramp means for raising at least one of the portions of the rig to an elevated generally horizontal position substantially the same height as the upper surface of the platform while wheels of the rig are supported thereon to thereby elevate and support the rig in the elevated operating position.

Abstract: A system for controlling the thickness of strip in a tandem mill having at least three stands. At a first lower speed the thickness of the strip is corrected in only a first one of the stands of the mill, and at a second higher speed the thickness error is corrected only in a second one of the stands, the second stand being downstream from the first stand. At intermediate speed a thickness error correction takes place in both a first and a second stand.