Browsing Virginia Tech Patents by Issue Date
Now showing items 1-20 of 689
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Fastening device
(United States Patent and Trademark Office, 1919-05-06) -
Reaction products of esters of polyphosphoric acids and heavy metal oxides and method of making same
(United States Patent and Trademark Office, 1951-03-13) -
Antibacterial compositions and methods of using same
(United States Patent and Trademark Office, 1963-03-19) -
Apparatus for transferring anaerobic bacteria
(United States Patent and Trademark Office, 1972-05-30)An apparatus for transfer of anaerobic bacteria under oxygen-free conditions having at least one pivotally mounted discharge for discharge of an oxygen-free gas downwardly toward a tube support and a discharge for discharge ... -
Anaerobic microbe transport assembly and method of using
(United States Patent and Trademark Office, 1976-02-17)Disclosure is made of a novel assembly for transporting anaerobic microbes from clinical patient to laboratory. The assembly provides a convenient and reliable means of maintaining microbial viability in the critical period ... -
Method and apparatus for automatically injecting the fluid contents of a plurality of pre-loaded syringes into a gas chromatograph or the like
(United States Patent and Trademark Office, 1976-08-10)An apparatus for sequentially dispensing the fluid contents of a plurality of pre-loaded syringes is disclosed. A first means sequentially places each of a plurality of pre-loaded syringes in a dispensing position, each ... -
Apparatus for breaking bacterial cells
(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 ... -
Heat flux gage
(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 ... -
Resonant converters with secondary-side resonance
(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, ... -
Non-destructive tester for transistors
(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 ... -
Modal domain optical fiber sensors
(United States Patent and Trademark Office, 1989-08-08)A modal domain optical fiber sensor for vibration monitoring and as a mechanical motion detector. A laser that focuses coherent light through a lens into one end of a multimode optical fiber. The fiber is secured to a ... -
Zero-voltage-switched multi-resonant converters including the buck and forward type
(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 ... -
Half-bridge zero-voltage switched multi-resonant converters
(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 ... -
Method of detecting, isolating and purifying clostridium difficile toxin A and its receptors
(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 ... -
Multi-loop control for quasi-resonant converters
(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. ... -
Antibody for C.difficile
(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. -
Preparation of open chain poly(reissert compounds)
(United States Patent and Trademark Office, 1990-05-29)An open chain poly Reissert can be formed by the initial reaction of an aromatic dialdehyde (e.g., terephthaldicaboxaldehyde) and primary amine (e.g., methylamine) to form a reaction product which is then reacted with an ... -
Process for the hydroformulation of olefinically unsaturated organic reactants using a supported aqueous phase catalyst
(United States Patent and Trademark Office, 1990-08-07)A process for the hydroformylation of alkenes and other olefinically unsaturated reactants by reaction with carbon monoxide and hydrogen in the presence of a heterogeneous catalyst comprising a solid surface having immobilized ... -
Novel phosphorus containing epoxy networks
(United States Patent and Trademark Office, 1990-11-27)Epoxy resins can be cured or crosslinked with triphenyl phosphine oxide compounds having epoxy-reactive (active hydrogen) substituents either alone or in combination with amine-terminated polyarylene ethers (e.g., ... -
Reissert compound of bisbenzimidazole
(United States Patent and Trademark Office, 1990-12-11)A Reissert compound of bisbenzimidazole can be formed by first reacting benzimidazole with an aliphatic diacid chloride to form bisbenzimidazole and then reacting the bisbenzimidazole with an aliphatic acid chloride and ...
