Patents by Inventor David L. Childress
David L. Childress has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240118444Abstract: A system to perform marine surveying may include a pair of identical design autonomous marine survey vehicles configured for coordinated operations. The vehicles may navigate and transit from a launch location to a geographically distant designated survey location, continuously survey and transit to a designated recovery location. A pair of vehicles may operate interchangeably at the sea surface, semi-submerged and underwater. Each may generate energy when operating at the surface and store energy in a rechargeable battery to power vehicle operation. The payload may include a sensor system to acquire seabed sensor data. A data storage system may store the sensor data. An on-board payload quality control system may analyze data validity. Positioning when the vehicle is collecting seabed sensor data may be determined with high precision, to provide survey data of high precision.Type: ApplicationFiled: May 16, 2023Publication date: April 11, 2024Applicant: Terradepth, Inc.Inventors: Josef Wolfel, Judson A. Kauffman, Andrew Resnick, Kenneth L. Childress, David L. Pearson, Joseph Curcio, Paul Holzer
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Patent number: 4992490Abstract: A coating composition is described that is comprised of (1) polyacrylate fibers, (2) at least one monomer which forms an acrylic polymer, (3) styrene monomer, (4) unsaturated polyester resin, (5) a polymerization inhibitor (to prevent premature polymerization prior to application), and (6) an inert carrier in which each acrylic polymer-forming monomer and the styrene monomer are soluble. The inert carrier described and the miscible/soluble components form a medium wherein polyacrylate fiber suspension is easily achieved and maintained. The coating composition can be used as a base coat or primer without need for finishing prior to application of an overcoat of paint.Type: GrantFiled: March 31, 1988Date of Patent: February 12, 1991Assignee: Miracle Shield PartnershipInventors: David L. Childress, Mark A. Garner, Sr., William L. Childress, John Power
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Patent number: 4791081Abstract: This invention discloses improved heterogeneous acid catalysts and a method for preparing these catalysts. A heterogeneous acid catalyst has been prepared by coating a carrier with an aqueous emulsion containing a fluorocarbonsulfonic acid polymer in the sulfonyl fluoride form, removing the excess water, heating to a temperature above the softening point of the polymer for a time, and then converting the polymer to the active sulfonic acid form. The substrate has pores of about 0.1 micrometers or greater and a surface area of about 20 m.sup.2 /g or less.Type: GrantFiled: December 30, 1986Date of Patent: December 13, 1988Assignee: The Dow Chemical CompanyInventors: David L. Childress, John D. Weaver, Emmett L. Tasset
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Patent number: 4358405Abstract: A dehydration catalyst and process for making an alkylenimine from an alkanolamine wherein the catalyst contains oxides of either tantalum or niobium together with the oxides of iron and chromium and in which the ratios of the metals are:M.sub.10 Fe.sub.0.5-2.9 Cr.sub.0.3-1.7wherein M is tantalum or niobium.Type: GrantFiled: March 25, 1981Date of Patent: November 9, 1982Assignee: The Dow Chemical Co.Inventors: William V. Hayes, David L. Childress
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Patent number: 4350830Abstract: A method for preparing acrylic acid by oxidation of acrolein over a new and improved catalyst providing conversions of acrolein of greater than 99% with yields of acrylic acid in excess of 95%. The catalyst consists essentially of the oxides of molybdenum, vanadium, chromium, copper and titanium and optionally silicon on an inert carrier. Catalysts useful in the process contain the elements previously mentioned in the atomic ratios ofMo.sub.15 V.sub.5-10 Cu.sub.2-5 Cr.sub.0.2-2 Ti.sub.Type: GrantFiled: October 17, 1979Date of Patent: September 21, 1982Assignee: The Dow Chemical Co.Inventors: David L. Childress, William V. Hayes, Richard L. Poppe
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Patent number: 4316708Abstract: A machine and method of operation are disclosed for continuously molding solid pellets from a mud composition. In a specific application, the machine is useful for producing an oxidation catalyst in pellet form. The machine includes a rotatable disk having small openings therein, which provide mold cavities. As the disk is rotated, the mud composition is injected into the mold openings through an injection head, which rides against the front face of the disk. The mud is retained in each mold opening by a backing plate, which rides against the back face of the disk. Ambient air is passed through a heater located at the top of a housing which partially encloses the disk. The heated air is circulated downwardly on both sides of the disk to dry the mud in the mold openings. An ejection head is positioned such that it rides against the front face of the rotating disk at a point behind the injection head. Pressurized air is forced through air passages in the ejection head, which register with the mold openings.Type: GrantFiled: June 30, 1977Date of Patent: February 23, 1982Assignee: The Dow Chemical CompanyInventors: Allen G. Skach, David L. Childress, William V. Hayes
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Patent number: 4301036Abstract: A dehydration catalyst containing tungsten oxide on a low surface area support and having a silica coating thereon. The catalyst has increased life and is useful for the dehydration of alkanolamines in making alkylenimines, e.g. ethanolamine is dehydrated to ethylenimine.Type: GrantFiled: July 18, 1980Date of Patent: November 17, 1981Assignee: The Dow Chemical CompanyInventors: David L. Childress, William V. Hayes
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Patent number: 4289656Abstract: A dehydration catalyst and process for making an alkylenimine from an alkanolamine wherein the catalyst contains oxides of either tantalum or niobium together with the oxides of iron and chromium and in which the ratios of the metals areM.sub.10 Fe.sub.0.5-2.9 Cr.sub.0.3-1.7wherein M is tantalum or niobium.Type: GrantFiled: July 17, 1980Date of Patent: September 15, 1981Assignee: The Dow Chemical CompanyInventors: William V. Hayes, David L. Childress
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Patent number: 4208306Abstract: A method for preparing acrylic acid by oxidation of acrolein over a new and improved catalyst providing conversions of acrolein of greater than 99% with yields of acrylic acid in excess of 95%. The catalyst consists essentially of the oxides of molybdenum, vanadium, chromium, copper and titanium and optionally silicon on an inert carrier. Catalysts useful in the process contain the elements previously mentioned in the atomic ratios ofMo.sub.15 V.sub.5-10 Cu.sub.2-5 Cr.sub.0.2-2 Ti.sub.1-3.Type: GrantFiled: October 26, 1978Date of Patent: June 17, 1980Assignee: The Dow Chemical CompanyInventors: David L. Childress, William V. Hayes, Richard L. Poppe
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Patent number: 4129600Abstract: A method of preparing acrolein and methacrolein by oxidation of propylene and isobutylene over a new improved catalyst providing conversions and yields, each greater than 90% in a single-pass reactor. The improved catalyst contains within certain prescribed proportions the oxides of cobalt, iron, bismuth, molybdenum, potassium, and optionally silicon. The metals have atomic ratios ofCo.sub.3-10 Fe.sub.0.5-3.0 Bi.sub.0.5-3.0 Mo.sub.15 K.sub.0.01-0.5 Si.sub.0.5-3.0and are present in the form of oxides as pellets, spheres, or on a support. With a recycle system, a conversion of the olefin greater than 99% and yield to the aldehyde of greater than 95% are possible.Type: GrantFiled: March 18, 1977Date of Patent: December 12, 1978Assignee: The Dow Chemical CompanyInventors: David L. Childress, William V. Hayes, Richard L. Poppe
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Patent number: 4049577Abstract: A method of preparing acrolein and methacrolein by oxidation of propylene and isobutylene over a new improved catalyst providing conversions and yields, each greater than 90% in a single-pass reactor. The improved catalyst contains within certain prescribed proportions the oxides of cobalt, iron, bismuth, molybdenum, potassium, and optionally silicon. The metals have atomic ratios ofCo.sub.3-10 Fe.sub.0.5-3.0 Bi.sub.0.5-3.0 Mo.sub.15 K.sub.0.01-0.5 Si.sub.0.5-3.0and are present in the form of oxides as pellets, spheres, or on a support. With a recycle system, a conversion of the olefin greater than 99% and yield to the aldehyde of greater than 95% are possible.Type: GrantFiled: December 15, 1975Date of Patent: September 20, 1977Assignee: The Dow Chemical CompanyInventors: David L. Childress, William V. Hayes, Richard L. Poppe
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Patent number: 4035262Abstract: A method of preparing acrylic acid by oxidation of acrolein over a new and improved catalyst providing conversions of acrolein of greater than 99% with yields of acrylic acid in excess of 95%. The catalyst consists essentially of the oxides of molybdenum, vanadium, chromium and copper and at least one of tantalum and niobium and optionally silicon on an inert carrier. Catalysts useful in the process contain the elements previously mentioned in the atomic ratios ofMo.sub.15 V.sub.5-10 Cu.sub.2-5 Cr.sub.0.2-2 M.sub.0.1-3where M is tantalum, niobium or mixtures thereof.Type: GrantFiled: April 19, 1976Date of Patent: July 12, 1977Assignee: The Dow Chemical CompanyInventors: David L. Childress, William V. Hayes, Richard L. Poppe