Patents by Inventor Charles Edwin Thorn
Charles Edwin Thorn 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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Patent number: 7186923Abstract: A printed wiring board comprising conductive layers separated by nonconductive material and having through holes or other nonconductive surfaces on which an electrically conductive carbon coating is formed. The conductive carbon coating includes electrically conductive carbon having a mean particle size not greater than about 1 micron and a water-dispersible organic binding agent. The conductive carbon coating formed on the nonconductive surfaces has a low electrical resistance and is tenacious enough to be plated and exposed to molten solder without creating voids or losing adhesion.Type: GrantFiled: December 5, 2003Date of Patent: March 6, 2007Assignee: Electrochemicals, Inc.Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Publication number: 20040084321Abstract: A method of applying a conductive carbon coating to a non-conductive surface and a printed wiring board having through holes or other nonconductive surfaces treated with such carbon coatings are disclosed. A conditioning agent is applied to the non-conductive surface to form a conditioned surface. A liquid dispersion of electrically conductive carbon (for example, graphite) having a mean particle size no greater than about 50 microns, combined with an organic binding agent, is coated on the conditioned surface to form an electrically conductive carbon coating. The conductive carbon coating is then optionally fixed on the (formerly) nonconductive surface and dried. The resulting coating has a low electrical resistance and is tenacious enough to be plated and exposed to molten solder without creating voids or losing adhesion, yet is easily removable from copper surfaces of the substrate by microetching.Type: ApplicationFiled: December 5, 2003Publication date: May 6, 2004Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Patent number: 6710259Abstract: A method of applying a conductive carbon coating to a non-conductive surface and a printed wiring board having through holes or other nonconductive surfaces treated with such carbon coatings are disclosed. A conditioning agent is applied to the non-conductive surface to form a conditioned surface. A liquid dispersion of electrically conductive carbon (for example, graphite) having a mean particle size no greater than about 50 microns, combined with an organic binding agent, is coated on the conditioned surface to form an electrically conductive carbon coating. The conductive carbon coating is then optionally fixed on the (formerly) nonconductive surface and dried. The resulting coating has a low electrical resistance and is tenacious enough to be plated and exposed to molten solder without creating voids or losing adhesion, yet is easily removable from copper surfaces of the substrate by microetching.Type: GrantFiled: September 17, 2001Date of Patent: March 23, 2004Assignee: Electrochemicals, Inc.Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Publication number: 20020150673Abstract: A method of applying a conductive carbon coating to a non-conductive surface and a printed wiring board having through holes or other nonconductive surfaces treated with such carbon coatings are disclosed. A conditioning agent is applied to the non-conductive surface to form a conditioned surface. A liquid dispersion of electrically conductive carbon (for example, graphite) having a mean particle size no greater than about 50 microns, combined with an organic binding agent, is coated on the conditioned surface to form an electrically conductive carbon coating. The conductive carbon coating is then optionally fixed on the (formerly) nonconductive surface and dried. The resulting coating has a low electrical resistance and is tenacious enough to be plated and exposed to molten solder without creating voids or losing adhesion, yet is easily removable from copper surfaces of the substrate by microetching.Type: ApplicationFiled: September 17, 2001Publication date: October 17, 2002Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Patent number: 6454868Abstract: A desmear process for removing resin smeared on an interior wall of a through hole drilled in a resinous substrate, especially resinous substrates made from epoxy, polyimide, cyanate ester resins or bis-maleimide triazine epoxy resins. The process involves contacting the resin smear with a mixture of gamma-butyrolactone and water to soften the resin smear, followed by treatment with an alkaline permanganate solution to remove the softened resin, and treatment with an aqueous acidic neutralizer to neutralize and remove the permanganate residues. The gamma-butyrolactone is effective as a single solvent for softening and swelling resin smears from substrates made from epoxy, polyimide, cyanate ester resins, bis-maleimide triazine epoxy resins, and polyimide resins.Type: GrantFiled: April 17, 2000Date of Patent: September 24, 2002Assignee: Electrochemicals Inc.Inventors: Frank Polakovic, William Yang, Charles Edwin Thorn, Michael Val Carano, Beth Ann LaFayette
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Patent number: 6303181Abstract: A method of applying a conductive carbon coating to a nonconductive surface, conductive carbon compositions for that purpose, and a printed wiring board having through holes or other nonconductive surfaces treated with such carbon compositions are disclosed. A conditioning agent, made (for example) by condensing a polyamide and epichlorohydrin, is applied to the nonconductive surface to form a conditioned surface. A liquid dispersion of electrically conductive carbon (for example, graphite) having a mean particle size no greater than about 50 microns is coated on the conditioned surface to form an electrically conductive carbon coating. The conductive carbon coating is then optionally fixed on the (formerly) nonconductive surface. Fixing may be accomplished, for example, by applying a fixing liquid such as a dilute aqueous acid to the carbon-coated surface. The coating is then dried.Type: GrantFiled: March 17, 2000Date of Patent: October 16, 2001Assignee: Electrochemicals Inc.Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Patent number: 6171468Abstract: A method of applying a conductive carbon coating to a non-conductive surface, conductive carbon compositions for that purpose, and a printed wiring board having through holes or other nonconductive surfaces treated with such carbon compositions are disclosed. A liquid dispersion of electrically conductive carbon (for example, graphite) having a mean particle size no greater than about 50 microns is coated on the non-conductive surface to form an electrically conductive carbon coating. The conductive carbon coating is then fixed on the (formerly) nonconductive surface. Fixing may be accomplished in a variety of different ways. For example, the fixing step can be carried out by applying a fixing liquid to the carbon-coated surface. One example of a suitable fixing liquid is a dilute aqueous acid. Fixing may also be carried out by removing the excess carbon dispersion with an air knife or other source of compressed air.Type: GrantFiled: November 21, 1997Date of Patent: January 9, 2001Assignee: Electrochemicals Inc.Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Patent number: 5725807Abstract: A method of applying a conductive carbon coating to a non-conductive layer, conductive carbon compositions, and a printed wiring board having through holes or other surfaces treated with such carbon compositions are disclosed. A board or other substrate including at least first and second electrically conductive metal layers separated by a non-conductive layer is provided. The board has a recess extending through at least one of the metal layers into the non-conductive layer. The recess has a non-conductive surface which is desired to be made electrically conductive. The carbon in the dispersion has a mean particle size no greater than about 50 microns. The method is carried out by applying the carbon dispersion to a non-conductive surface of the recess to form a substantially continuous, electrically conductive carbon coating. Optionally, the coating is then fixed, leaving the carbon deposit as a substantially continuous, electrically conductive layer. Chemical and physical fixing steps are disclosed.Type: GrantFiled: June 7, 1995Date of Patent: March 10, 1998Assignee: Electrochemicals Inc.Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf
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Patent number: 5690805Abstract: A method of applying a conductive carbon coating to a non-conductive layer, conductive carbon compositions, and a printed wiring board having through holes or other surfaces treated with such carbon compositions are disclosed. A board or other substrate including at least first and second electrically conductive metal layers separated by a non-conductive layer is provided. The board has a recess extending through at least one of the metal layers into the non-conductive layer. The recess has a non-conductive surface which is desired to be made electrically conductive. The carbon in the dispersion has a mean particle size no greater than about 50 microns. The method is carried out by applying the carbon dispersion to a non-conductive surface of the recess to form a substantially continuous, electrically conductive carbon coating. Optionally, the coating is then fixed, leaving the carbon deposit as a substantially continuous, electrically conductive layer. Chemical and physical fixing steps are disclosed.Type: GrantFiled: June 7, 1995Date of Patent: November 25, 1997Assignee: Electrochemicals Inc.Inventors: Charles Edwin Thorn, Frank Polakovic, Charles A. Mosolf