Field-controlled high-power semiconductor devices: 6107649

Zhao Jian H

Inventor(s): Zhao Jian H

Issued: 8/22/2000

Abstract: Power semiconductor devices have a plurality of semiconductor layers of alternating p-type and n-type conductivity and top and bottom device surfaces. A layer of the top surface forms a control layer. A semiconductor layer junction, remote from top and bottom device surfaces, forms a blocking p-n junction capable of sustaining the applied device voltage. A top ohmic contact overlays a top conductive region extending from the top surface into the control layer. A conductive tub region, spaced apart from the top conductive region, extends from the top surface at least through the control layer. A field effect region is disposed in the control layer between the top conductive region and tub region. A gate contact is formed over the field effect region causing the creation and interruption of a conductive channel between the top conductive region and the conductive tub region so as to turn the device on and off. In one device embodiment, a separate latch-on gate overlying the conductive tub is provided for device turn-on.

USPTO Webpage 6107649

Porous polymer scaffolds for tissue engineering: 6103255

Inventor(s): Levene Howard B, Lhommeau Christelle M, Kohn Joachim B

Issued: 8/15/2000

Abstract: Biodegradable and biocompatible porous scaffolds characterized by a substantially continuous polymer phase, having a highly interconnected bimodal distribution of open pore sizes with rounded large pores of about 50 to about 500 microns in diameter and rounded small pores less than 20 microns in diameter, wherein the small pores are aligned in an orderly linear fashion within the walls of the large pores. Methods of preparing polymeric tissue scaffolds are also disclosed.

USPTO Webpage 6103255

Materials and methods for amplifying polynucleotides in plants: 6100092

Inventor(s): Borysyuk Mykola, Borysyuk Lyudmyla, Raskin Ilya

Issued: 8/8/2000

Abstract: Products and methods for amplifying target nucleic acids using cells derived from plants are disclosed. The products include nucleic acids containing a plant active Amplification Promoting Sequence (APS) and the methods exploit these products in amplifying target nucleic acids. Also disclosed are methods for amplifying target nucleic acids that express an encoded product, and the recovery of that expression product. The methods of the invention minimize operator intervention and exploit solar energy and the minimal nutrient needs of photoautotrophic organisms to provide inexpensive and indefinitely sustainable methods for producing a variety of amplified target nucleic acids and encoded products such as polypeptides.

USPTO Webpage 6100092

Method of improved mixing in roller bottles: 6096544

Inventor(s): Bramble Joye L, Muzzio Fernando J, Searles James A

Issued: 8/1/2000

Abstract: A method for enhancing the mixing of materials in a roller bottle by the introduction of controlled axial and cross-sectional flow perturbations is disclosed. The effectiveness of the method is demonstrated by achieving higher efficiency in cell culturing and virus propagation in roller bottles by introducing controlled flow perturbations during the process.

USPTO Webpage 6096544

Methods for recovering polypeptides from plants and portions thereof: 6096546

Inventor(s): Raskin Ilya

Issued: 8/1/2000

Abstract: Methods for using plants or intact portions thereof to produce and exude heterologous polypeptides are disclosed. The methods of the invention use whole plants or portions thereof that are intact, living and capable of exuding the produced polypeptides. The methods of the invention minimize operator intervention and exploit solar energy and the minimal nutrient needs of photoautotrophic organisms to provide inexpensive and indefinitely sustainable methods for producing a variety of heterologous polypeptides.

USPTO Webpage 6096546