Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4980039 | Microwave-mediated degradation of PCB wastes This is disclosed a process for the decomposition of halogenated hydrocarbons including polychlorinated biphenyls (PCB) and chlorinated pesticides, as DDT and DDE. The process comprises microwave-mediated wet-ashing of the halogenated hydrocarbons(s) in c... | 12/25/1990 |
| 4946566 | Photochemical production of hydrogen peroxide The present invention relates to a photochemical process for the manufacture of hydrogen peroxide wherein a 9,10-phenanthraquinone compound is exposed, in the presence of an effective amount of a hydrogen donor alcohol, to electromagnetic radiation to pho... | 08/07/1990 |
| 4941256 | Automatic visual measurement of surface mount device placement A method for inspecting the placement and alignment of surface mounted components on printed circuit boards during assembly. After the component is placed on the board, an infrared camera provides an image of leads on the component and corresponding solde... | 07/17/1990 |
| 4941725 | All-optical planar modulator structure with channel waveguides All optical modulators are disclosed which include a channel waveguide made of an optically nonlinear material and transmitting an infrared beam. A control light whose wavelength is shorter than the bandgap energy of the channel of the guide is directed t... | 07/17/1990 |
| 4929553 | Protease for specific processing of secreted proteins This invention is concerned with the specific processing of secreted proteins in genetically modified yeast cells. The yeast KEX1 gene was cloned and the KEX1 product was shown to be a serine protease, evidently a carboxypeptidase B-like protease. A proba... | 05/29/1990 |
| 4927635 | Device for controlling stored food insects This invention relates to a device for controlling certain common insect pests of stored food products in human residences, food storages and the like. It comprises, generally, a substrate, such as paper, cardboard or plastic and a deposit of silica aerog... | 05/22/1990 |
| 4902507 | Toxic strains of the bacterium Bacillus thuringiensis for control of the bertha armyworm Mamestra configurata An insecticidal composition for controlling or inhibiting the growth of larvae of the Bertha armyworm, comprising an insecticidal substance of one or more strains of Bacillus thuringiensis and an insecticidally acceptable carrier. The strains belong to th... | 02/20/1990 |
| 4902344 | Ferric chloride leach of a metal-sulphide bearing material The present invention relates to an aqueous ferric chloride leach process for the extraction of metal values from a metal-sulphide bearing material, the leach being carried out in the presence of a leaching aid chosen from among salts of diesters of sulph... | 02/20/1990 |
| 4900119 | Wavelength selective optical devices using optical directional coupler New types of narrowband wavelength selective optical devices are described. Various configurations are possible, according to the invention, that perform as narrowband wavelength selective transmission or reflection filters or as narrowband wavelength sel... | 02/13/1990 |
| 4894806 | Ultrasonic imaging system using bundle of acoustic waveguides An ultrasonic imaging system for transmitting ultrasonic pulses into an object and detecting reflected ultrasonic waves therefrom. The system is provided with delay lines for real time imaging. The system comprises a probe means having a transmitting bund... | 01/16/1990 |
| 4894537 | High stability bimorph scanning tunneling microscope A novel scanning tunneling microscope (STM) is described which is constructed almost entirely of one metal e.g. aluminum and uses bimorph piezoelectric disks as the x, y, z drive elements. The design uses a simple, rugged tirpod configuration for the fine... | 01/16/1990 |
| 4880473 | Process for the production of fermentable sugars from biomass A process for the production of fermentable sugars from wood or other cellulose-containing biomasses, comprises the steps of (a) hydrolysing the biomass with a dilute sulfuric acid to dissolve hemicellulose while leaving most of cellulose in a solid phase... | 11/14/1989 |
| 4871669 | Production of natural flavor aldehydes from natural source primary alcohols C2 -C7 Methylotrophic yeasts of the genera Pichia, Torulopsis, Candida and Hansenula when grown on methanol, make use of an enzyme, alcohol oxidase, to catalyse the initial oxidation of methanol to formaldehyde. Non-growing whole cells of such methylotrophic yea... | 10/03/1989 |
| 4872146 | Method and apparatus for simulating phase coherent signal reflections in media containing randomly distributed targets A method of simulating phase coherent signal reflections in media containing randomly distributed targets capable of scattering signals transmitted through the media, wherein the energy of signals directly scattered by the targets is significantly greater... | 10/03/1989 |
| 4870121 | Electrical tree suppression in high-voltage polymeric insulation Polymeric dielectrics which are exposed to highly divergent electric fields break down more quickly than expected because of the generation of ultra-violet radiation at defect points which degrades the polymer locally and leads to the formation of electri... | 09/26/1989 |
| 4867755 | Preparation of composite fuels, with reduced sulfur emission characteristics, from oily and carbonaceous wastes A method of preparing a sulfur-containing composite fuel is provided to utilize some high-sulfur content solid and semi-solid fuels such as tar sand coke and refinery tank sludges by reducing their sulfur emission on combustion. The method comprises the s... | 09/19/1989 |
| 4868040 | Antiballistic composite armor The present invention relates to a unitary anti-ballistic composite armor of the type which comprises a base layer element and an energy absorbing body, the base layer element comprising a plurality of layers of reinforcing fibrous material embedded, in l... | 09/19/1989 |
| 4864638 | FM receivers using three-terminal negative admittance networks or two and three-terminal negative admittance networks Novel FM receivers are disclosed, which are very compact and simple yet possess high sensitivity. The receivers use novel three-terminal and two-terminal negative admittance networks. In one embodiment, one three-terminal negative admittance network forms... | 09/05/1989 |
| 4859829 | Adaptive welding control vision head An adaptive welding control vision head with a metal enclosure for attachment to a welding head. The side of the enclosure facing the workpiece is angled away from the welding head, has two apertures and its external surface is coated with oil. Mounted in... | 08/22/1989 |
| 4851484 | Anhydride-based fortifiers for anhydride-cured epoxy resins An anhydride-cured epoxy resin (epoxy resin+anhydride curing agent+catalyst) may be fortified (i.e. increased in strength and modulus without being made brittle) by the addition of a carboxylic acid and the reaction product of a carboxylic acid anhydride ... | 07/25/1989 |
| 4846004 | Streamlined oceanographic sampling bottle An oceanographic sampling bottle providing low drag for a rapid descent rate and low susceptibility to leakage after sample acquisition. The sampling bottle comprises streamlined inlet and outlet valve members shaped and positioned to avoid flow separatio... | 07/11/1989 |
| 4836039 | Method and apparatus for introduction of a particulate sample for analysis A method and apparatus for delivering a particulate sample to an analyzing device such as a flame or plasma spectrometer, which provides relatively uniform, continuous and controlled delivery of a sample and allows sample changing without disrupting the o... | 06/06/1989 |
| 4837146 | Forecasting the risk of sclerotinia stem rot in crops Sclerotinia stem rot, caused by the fungus Sclerotinia sclerotiorum (L ib.) de Bary, is a major disease of rapeseed (canola) in western Canada and many other parts of the world. Significant yield losses result from severe crop infestatons. A method of ste... | 06/06/1989 |
| 4833401 | Electrical measuring instrument for high voltage power measurements A current-comparator technique for obtaining an instrument for accurate high voltage power measurements at very low power factors is described. The quadrature component of the load current is automatically balanced in the current comparator against a quad... | 05/23/1989 |
| 4831126 | Antigenic polysaccharide specific to Brucella abortus and Yersinia enterocolitica serotype 0:9 The antigenic O-chain polysaccharides from Brucella abortus and Yersinia enterocolitica serotype 0:9 have similar structure, i.e. 1-2 linked 4,6-dideoxy-4-formamido--D-mannopyranosyl units. The antigen is more readily isolated from the Yersinia and... | 05/16/1989 |
| 4825146 | Unthreshed head grain loss monitor A device for indicating grain loss resulting from unthreshed heads in a combine harvester using a microwave transmitter-sensor. The device provides an output signal whose magnitude is a function of the mass of passing effluent which when compared to that ... | 04/25/1989 |
| 4810954 | Poynting vector probe for measuring electrical power A new probe for measuring electric power flow from a source of supply to a load at high voltage and current, but at extremely low power factor is disclosed. The probe enables the direct measurement of electric power, in accordance with the Poynting theore... | 03/07/1989 |
| 4808208 | Phenolic safeners for glyphosate herbicides Glyphosate herbicides are used for weed control in crops. It has been found that the desired crop plants can be protected from the herbicidal effect by providing a pretreatment so that the crop plants have assimilated a phenolic compound found to give a s... | 02/28/1989 |
| 4800271 | Galvanometric optical scanning system having synchronization photodetectors A galvanometric optical scanning system is disclosed. In order to compensate errors in phase, zero drift etc., at least two synchronization photodetector means are provided in an optical path of scanning beam of light. The pulses produced by the photodete... | 01/24/1989 |
| 4800270 | Galvanometric optical scanning system having a pair of closely located synchronization A galvanometric optical scanning system is disclosed. In order to compensate errors in phase, zero drift etc., beam position detection means is provided in an optical path of scanning beam of light and comprises a pair of closely located photodetectors. T... | 01/24/1989 |
| 4757202 | Solid state dosimeter This invention provides a direct reading solid-state dosimeter which will measure neutron and gamma radiation. A dual metal-oxide-semiconductor field-effect transistor (MOSFET) is used as a gamma sensor and a forward biased PIN diode as a neutron sensor. ... | 07/12/1988 |
| 4739028 | Epoxy fortifiers based on aromatic polyhydroxyl compounds Epoxy resins have been found to be fortified (increased in strength and modulus yet not made brittle) by compounding: (a) a resin-forming polyepoxide (b) an amine curing agent for (a) and (c) a fortifier for (a)+(b) comprising the reaction product of (i) an aromati... | 04/19/1988 |
| 4727349 | Depleted channel photoconductor Photoconductors with channels that lie in the surface depleted region of a GaAs structure are described. These devices have nanoampere bias current, and exhibit photoconductive gain. In contrast to other photoconductors, their low frequency responsivity i... | 02/23/1988 |
| 4721854 | Quadrupole mass spectrometer This disclosure presents an alternative, improved approach to the RF only quadrupole mass spectrometers. The ions whose masses place them near the stability limit for a given operating voltage and RF frequency, can be strongly influenced by the applicatio... | 01/26/1988 |
| 4701306 | Concentrator for detection of amine vapors A method, and air sampler concentrator, for sampling and detecting trace quantities of amine vapors in ambient atmospheres, are described. Atmospheres containing vapors of amines, particularly aralkyl amines such as amphetamines, are sampled and vapors co... | 10/20/1987 |
| 4700197 | Adaptive array antenna A small linearly polarized adaptive array antenna for communication systems is disclosed. The directivity and pointing of the antenna beam can be controlled electronically in both the azimuth and elevation planes. The antenna has low RF loss and operates ... | 10/13/1987 |
| 4677842 | Ultrasonic density measurement The density of polyethylene is determined by measuring the velocity of ultrasound through the material. The determination of density is based on the correlation between the velocity of ultrasound in semi-crystalline materials and their density, and involv... | 07/07/1987 |
| 4622559 | Paraboloid reflector antenna feed having a flange with tapered corrugations The antenna feed includes a waveguide radiator with a conductive flange positioned about the waveguide near its radiating end. The flange includes one or more corrugations which each have tapered walls and which is truncated at its root and crest by a fla... | 11/11/1986 |
| 4615579 | Prism light guide luminaire The luminaire for a prism light guide system consists of a longitudinal hollow structure made of transparent dielectric material. The structure has inner and outer surfaces which are in octature, and at least a portion of one outer surface that has a ligh... | 10/07/1986 |
| 4612641 | Infrared pulse compression A plasma is induced in a transmissive medium, and causes a chirp to be impressed on an optical pulse. The chirped pulse when passed through a dispersing means is then compressed. Applications of this pulse compression technique include the generation of s... | 09/16/1986 |
