Patents Assigned to The P. D. George Company
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Publication number: 20080182943Abstract: A one-component curable insulating coating composition comprises encapsulated catalysts and encapsulated curing agents mixed with an unsaturated resin. The encapsulated catalyst and/or curing agent is prevented from chemically contacting the resin until a cure temperature is achieved. The one-component coating composition has a shelf life that is equal to or greater than 6 months and a cure temperature and/or cure time that is lower than the cure temperature and/or cure time normally associated with currently available multi-component coating compositions.Type: ApplicationFiled: January 29, 2007Publication date: July 31, 2008Applicant: The P.D. George CompanyInventors: Ronald W. Goetter, Max F. Vandersall
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Publication number: 20070142526Abstract: Use of the barrier property effect of nanomaterials to improve the electrical insulation resistance and corrosion protection strength properties of electromagnetic devices. The beneficial effects are realized with nanomaterial loadings of 1-20%, and preferably between 1-5%, parts by weight of coating resins. Nanomaterials include, but are not limited to, silica, alumina, zirconia, and antimony pentoxide, which are dispersed either directly into a coating, or pre-dispersed in a carrier appropriate to the solvent of the resin system. The rheology of the resin system is not significantly altered which would otherwise affect processing of the resins for their intended applications.Type: ApplicationFiled: March 1, 2007Publication date: June 21, 2007Applicant: THE P. D. GEORGE COMPANYInventors: Ronald Goetter, David Vines
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Patent number: 5948338Abstract: It is generally known that the most common reason for replacing rotary electric machines is failure of field windings. Vibrations and primary overheating of field windings is the main reason for motor and generator repair. Consequently field windings have been fan cooled, externally ventilated, and totally enclosed. To solve this failure problem stators have been completely encapsulated, drip coated, and entirely coated. But all of these procedures are subject to certain disadvantages. The method and means herein overcome such disadvantages. Means are provided for embedding in a solid material field windings of stators of rotary electric machines in order to insulate and cool electric machines in which the stators are employed.Type: GrantFiled: December 16, 1997Date of Patent: September 7, 1999Assignee: The P.D. George CompanyInventor: Francis L. George, Jr.
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Patent number: 5759589Abstract: It is generally known that the most common reason for replacing rotary electric machines is failure of field windings. Vibrations and primary overheating of field windings is the main reason for motor and generator repair. Consequently field windings have been fan cooled, externally ventilated, and totally enclosed. To solve this failure problem stators have been completely encapsulated, drip coated, and entirely coated. But all of these procedures are subject to certain disadvantages. The method and apparatus herein overcome such disadvantages. The apparatus includes structural members for embedding in a solid material field windings of stators of rotary electric machines in order to insulate and cool electric machines in which the stators are employed.Type: GrantFiled: March 11, 1996Date of Patent: June 2, 1998Assignee: P. D. George CompanyInventor: Francis L. George, Jr.
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Patent number: 5171797Abstract: An hydrolytically stable, heat-curable composition useful as an hermetic varnish for electrical conductors comprising an aqueous solution with or without organic co-solvents of:1) an adduct of an epoxide of a phenol-formaldehyde condensate and a dialkanolamine, and2) a water-soluble curing agent comprising both a phenoplast alcohol and an aminoplast such as a melamine for example, hexamethoxymethylmelamine;the cured products thereof which are useful as hermetic varnishes for electrical conductors. i.e. varnishes exposed to refrigerants such as fluorocarbons.Type: GrantFiled: December 3, 1991Date of Patent: December 15, 1992Assignee: The P.D. George CompanyInventors: James I. Crowley, Ronald W. Goetter
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Patent number: 4623696Abstract: This invention relates to:(1) Unsaturated polyesters modified with dicyclopentadienes (DCPD) and tris(2-hydroxyethyl)isocyanurate (THEIC)(2) Blends of such polyesters with polymerizable ethylenically unsaturated monomers(3) The cured products of (1) and (2), and(4) The use of such products in a wide variety of applications including electrical applications, sheets and films thereof, both non-reinforced and reinforced, "B" stage resins, etc.These compositions possess excellent properties and bond strengths at high temperatures.Type: GrantFiled: May 2, 1985Date of Patent: November 18, 1986Assignee: The P. D. George CompanyInventors: David W. Mabrey, James M. Dye
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Patent number: 4487911Abstract: A stable solution of an aromatic polyamic acid of controlled molecular weight, of the type capable of being converted to polyimides, which undergoes relatively little change in viscosity or gelling over extended periods of time at room temperature. Such solution may be prepared by reacting impure aromatic dianhydride with aromatic diamine in a suitable solvent where the ratio of active aromatic diamines is approximately equimolar. Such solution may also be prepared by a two step process which comprises:Step I-Reacting a dianhydride of high purity (99+%) with a diamine in a molar ratio of about 0.95/1 dianhydride/diamine to yield a viscosity below about 10,000 cps, for example from about 2,000 to 6,000 at about a 10-15% solution.Step II-Then adding to I about 0.05 mole of a less pure dianhydride such as from about 97-99% pure dianhydride to yield a 10-15% solution of polyamic acid having a viscosity of about 10,000 cps.Type: GrantFiled: June 30, 1980Date of Patent: December 11, 1984Assignee: The P. D. George CompanyInventors: Daniel J. Lange, Daniel J. Marquardt
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Patent number: 4446300Abstract: This invention relates to polymers prepared by reacting cyanuric acid and ethylene carbonate in situ to form the corresponding Tris(2-hydroxyethyl)isocyanurate-containing polymers including polyesters, polyester-imides, polyester-amide-imides, oil-modified derivatives thereof, etc. This invention also relates to such products employed as electrical insulation.Type: GrantFiled: June 27, 1983Date of Patent: May 1, 1984Assignee: The P. D. George CompanyInventors: David W. Mabrey, Daniel J. Lange, Daniel J. Lee
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Patent number: 4375528Abstract: This invention relates to (1) water soluble and/or dispersible compositions characterized by the presence of oil modified imidized polyesters; and to (1) which also contains curable resins. This invention also relates to a wide variety of uses for such compositions, such as electrical insulations, for example as in insulation varnishes, and related uses.Type: GrantFiled: May 26, 1981Date of Patent: March 1, 1983Assignee: The P. D. George CompanyInventor: Daniel J. Lange
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Patent number: 4113706Abstract: This invention relates to imino dicarboxylic acids (IDA) of the general formulae ##STR1## where Z is a moiety, preferably aromatic, R is a moiety, preferably aliphatic, and to resins derived from such acids. Such resins, which may vary widely, are illustrated by polyesters, poly(ester-amides), poly(ester-imides), poly(ester-imide-amides), etc. In the preferred embodiment such resins contain tris (hydroxyethyl) isocyanurate. The preferred IDA, which is derived from trimellitic anhydride (TMA) and glycine, has the following idealized formula ##STR2## IS THE PREDOMINANT DICARBOXYLIC ACID EMPLOYED IN SUCH RESINS. This invention also relates to aromatic IDA where R is aryl as illustrated by IDA derived from aminobenzoic acid and resins prepared therefrom.Type: GrantFiled: August 11, 1977Date of Patent: September 12, 1978Assignee: The P. D. George CompanyInventor: Daniel J. Lange
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Patent number: 4081427Abstract: This invention relates to a process of reformulating a solvent polyester-type resin, such as employed in electrical insulation, for example in wire enamels, to a solventless polyester-type wire resin of similar properties which is characterized by increasing the relative hydroxy-functionality of said polyester-type resin as compared to the hydroxy-functionality of a corresponding solvent-type wire resin.In the preferred embodiment the increased hydroxy-functionality, in whole or in part, is derived from the use of, or the increased content, of tris(2-hydroxyethyl) isocyanurate. The polyester-type wire enamels include polyesters and polyesters containing other groups such as polyester-amides, polyester-imides, polyester-amide-imides, etc. By doing this, resins having the desired properties as well as viscosities suitable for wire insulation can be made and applied in solventless systems.Type: GrantFiled: December 20, 1974Date of Patent: March 28, 1978Assignee: The P. D. George CompanyInventor: Daniel J. Lange
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Patent number: 4069209Abstract: This invention relates to imino dicarboxylic acids (IDA) of the general formulae ##STR1## and ##STR2## where IS A MOIETY, PREFERABLY AROMATIC, R is a moiety, preferably aliphatic, and to resins derived from such acids. Such resins, which may vary widely, are illustrated by polyesters, poly(ester-amides), poly (ester-imides), poly(ester-imide-amides), etc. In the preferred embodiment such resins contain tris (hydroxyethyl) isocyanurate. The preferred IDA, which is derived from trimellitic anhydride (TMA) and glycine, has the following idealized formula ##STR3## and IS THE PREDOMINANT DICARBOXYLIC ACID EMPLOYED IN SUCH RESINS.Type: GrantFiled: April 12, 1976Date of Patent: January 17, 1978Assignee: The P. D. George CompanyInventor: Daniel J. Lange