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    Zero-voltage-switched multi-resonant converters including the buck and forward type 

    Lee, Fred C.; Tabisz, Wojciech A. (United States Patent and Trademark Office, 1989-08-15)
    A multi-resonant-switching network that operates under switching conditions that are favorable to both the active switch and the diode that constitute the switch. In a zero-current multi-resonant switch, the resonant circuit ...
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    Resonant converters with secondary-side resonance 

    Lee, Fred C.; Liu, Kwang-Hwa (United States Patent and Trademark Office, 1988-11-15)
    A family of quasi-resonant converters is disclosed as comprising a voltage source, a transformer having primary and secondary windings, and a switch for periodically coupling the voltage source to the primary winding, ...
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    Heat flux gage 

    Diller, Thomas E.; Onishi, Shinzo (United States Patent and Trademark Office, 1988-10-25)
    The invention is a heat flux gage applied to a surface, for the measurement of surface heat transfer. All elements of the gage are thin films, deposited on the surface by sputtering or an equivalent process. The gage ...
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    Method of detecting, isolating and purifying clostridium difficile toxin A and its receptors 

    Wilkins, Tracy D.; Krivan, Howard C. (United States Patent and Trademark Office, 1989-09-05)
    A method is provided for detecting the presence of C. difficile toxin A. Stool or other appropriate specimen is contacted with a reagent containing an available non-reducing galactose-alpha-1-3-galactosyl structure, which ...
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    Non-destructive tester for transistors 

    Lee, Fred C.; Chen, Dan Y.; Carpenter, Grant (United States Patent and Trademark Office, 1989-07-25)
    A non-destructive reverse-bias second breakdown tester for testing semiconductor devices such as transistors and thyristors that have a base-collector-emitter configuration. The tester basically comprises a socket for ...
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    Half-bridge zero-voltage switched multi-resonant converters 

    Lee, Fred C.; Tabisz, Wojciech A.; Jovanovic, Milan M. (United States Patent and Trademark Office, 1989-08-22)
    A half-bridge zero-voltage-switched multi-resonant converter. The converter basically comprises a device for converting an input voltage signal to a DC output signal to be imposed across a load. The device includes input ...
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    Antibody for C.difficile 

    Wilkins, Tracy D.; Lyerly, David M. (United States Patent and Trademark Office, 1989-11-07)
    Monoclonal antibody to toxin A of C.difficile has been prepared and is used in an assay for toxin A of C.difficile.
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    Multi-loop control for quasi-resonant converters 

    Lee, Fred C.; Ridley, Raymond B. (United States Patent and Trademark Office, 1989-09-12)
    A multi-loop controller for controlling a quasi-resonant converter having a power switch, a filter inductor and an output voltage. The controller includes a sensor circuit for sensing the output voltage of the converter. ...
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    Apparatus for breaking bacterial cells 

    Moore, Walter E. C.; Blanks, James A. (United States Patent and Trademark Office, 1981-10-20)
    A multiple tube holder is suspended at the upper end on a frame so that the lower end can pivot through a small arc about a horizontal axis adjacent the upper end of the holder. A motor is connected to the lower end of the ...

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    Patent Typeutility (9)InventorLee, Fred C. (5)Tabisz, Wojciech A. (2)Wilkins, Tracy D. (2)Blanks, James A. (1)Carpenter, Grant (1)... View MoreAssigneeVirginia Tech Intellectual Properties, Inc. (7)Virginia Polytechnic Institute and State University (1)VPI Educational Foundation (1)Publication Date1989 (6)1988 (2)1981 (1)Has File(s)Yes (9)

    If you believe that any material in VTechWorks should be removed, please see our policy and procedure for Requesting that Material be Amended or Removed. All takedown requests will be promptly acknowledged and investigated.

    Virginia Tech | University Libraries | Contact Us