Patents by Inventor Henry M. Demarest

Henry M. Demarest 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).

  • Method of making glass with preliminary reaction of batch materials
    Patent number: 4920080
    Abstract: Silica is reacted with sodium carbonate to form sodium silicate as a preliminary step in a glass melting process. Preferably, calcium carbonate-containing batch materials are calcined separately and then combined with the sodium silicate as liquefying is initiated. The materials may be substantially free of bubble-producing carbonates as the molten phase begins to form.
    Type: Grant
    Filed: August 19, 1988
    Date of Patent: April 24, 1990
    Assignee: PPG Industries, Inc.
    Inventor: Henry M. Demarest, Jr.
  • Batch melting vessel lid cooling construction
    Patent number: 4789390
    Abstract: A lid of a glass batch melting vessel is subjected to corrosive and thermal degradation. The lid is cooled and the temperature of the exploded inner surface of the lid is controlled such that particulate and molten materials entrained in exhaust gas circulating within the vessel adhere to the lid surface forming a protective, insulating coating that prolongs the service life of the lid.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: December 6, 1988
    Assignee: PPG Industries, Inc.
    Inventors: Gerald E. Kunkle, George A. Pecoraro, Henry M. Demarest, Jr.
  • Method and apparatus for feeding a rotating melter
    Patent number: 4666489
    Abstract: In a rotating vessel for liquefying pulverulent material wherein the pulverulent material forms a lining on sidewall portions of the vessel, pressing means are provided for creating a flattened end portion at the top of the lining onto which additional pulverulent material is fed and subsequently pressed into the lining. The pressing means is preferably a rotationally driven wheel and the pulverulent material may be glass batch. A more stable feeding operation and reduction of dusting are attained.
    Type: Grant
    Filed: December 6, 1985
    Date of Patent: May 19, 1987
    Assignee: PPG Industries, Inc.
    Inventor: Henry M. Demarest
  • Method of melting raw materials for glass or the like with staged combustion and preheating
    Patent number: 4634461
    Abstract: Raw materials such as glass batch are preheated by combustion of liquid or solid fuel such as fuel oil or coal mixed with the batch material. In one embodiment the material being heated and the gaseous products of combustion are passed cocurrently through the preheating stage to avoid carbonaceous effluents. Preheated materials and any ash from the fuel are transferred to a second stage where they are liquefied. Carbon monoxide from the preheating stage may serve as fuel for the liquefying stage.
    Type: Grant
    Filed: June 25, 1985
    Date of Patent: January 6, 1987
    Assignee: PPG Industries, Inc.
    Inventors: Henry M. Demarest, Jr., Gerald E. Kunkle, Clement C. Moxie
  • Method of melting raw materials for glass or the like using solid fuels or fuel-batch mixtures
    Patent number: 4632687
    Abstract: Thermally fusible material such as glass batch is liquefied using a solid carbonaceous fuel such as coal as the major energy source. In another embodiment, solid or liquid fuel is mixed with the batch material being fed to an initial liquefaction stage. Melting may be advanced further in a subsequent stage where the melt may also be re-oxidized.
    Type: Grant
    Filed: June 25, 1985
    Date of Patent: December 30, 1986
    Assignee: PPG Industries, Inc.
    Inventors: Gerald E. Kunkle, Henry M. Demarest, Larry J. Shelestak
  • Method and apparatus for inductively heating molten glass or the like
    Patent number: 4610711
    Abstract: Glass or the like is melted by liquefying batch materials in a first stage by means of radiant heating, and further advancing the melting process in a second stage where the melt is heated by induction heating. Another aspect of the invention provides a residence zone at the exit of the induction heating stage to aid elimination of gaseous inclusions.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: September 9, 1986
    Assignee: PPG Industries, Inc.
    Inventors: Joseph M. Matesa, Kwang J. Won, Henry M. Demarest, Jr.
  • Method of pretreating glass batch
    Patent number: 4604121
    Abstract: In a glass batch liquefying process, batch-entrained nitrogen is purged by contacting the batch with a substantially nitrogen-free gas in a pretreating stage.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: August 5, 1986
    Assignee: PPG Industries, Inc.
    Inventors: Henry M. Demarest, Jr., Joseph M. Matesa, Gerald E. Kunkle
  • Melting glass with port and melter burners for NO.sub.x control
    Patent number: 4599100
    Abstract: When primary fuel for combustion is combined with an amount of oxygen in excess of the stoichiometric amount required for complete combustion, in the ports of a glassmaking furnace, additional fuel is injected into the melting chamber to consume at least a portion of the excess oxygen and reduce at least a portion of NO.sub.x present in the melting chamber, to thereby reduce or suppress NO.sub.x emissions from the furnace.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: July 8, 1986
    Assignee: PPG Industries, Inc.
    Inventor: Henry M. Demarest, Jr.
  • Method of calcining and liquefying glass batch
    Patent number: 4539030
    Abstract: In a two stage glass batch liquefying process, calcium source material is preheated in a first stage in the absence of the major sodium source material, and the heated calcium source material and the sodium source material are combined and liquefied in a second stage.
    Type: Grant
    Filed: August 3, 1983
    Date of Patent: September 3, 1985
    Assignee: PPG Industries, Inc.
    Inventors: Henry M. Demarest, Jr., Joseph M. Matesa
  • Two stage batch liquefaction process and apparatus
    Patent number: 4519814
    Abstract: Liquefying of pulverulent batch materials (e.g., glass batch) is carried out in two stages. The first stage utilizes extended gas/solid contact to heat the materials to an intermediate temperature, and may recover waste heat. The second stage rapidly liquefies the material in a cavity lined with the batch material, and may employ substantially nitrogen-free heat sources. Another aspect involves maintaining a wet condition in the first stage to entrap particulates.
    Type: Grant
    Filed: July 25, 1983
    Date of Patent: May 28, 1985
    Assignee: PPG Industries, Inc.
    Inventor: Henry M. Demarest, Jr.
  • Method of and apparatus for removing gas inclusions from a molten glass pool
    Patent number: 4406683
    Abstract: Removal of gas inclusions from a molten glass pool is enhanced by inserting a gas inclusion-permeable, refractory metallic or ceramic screen in the downstream flowing, upper portion of the pool, to diminish the glass flow rate adjacent the surface by viscous drag forces while permitting gas inclusions to rise through the screen to the surface of the molten glass pool to dissipate into the atmosphere therealong.
    Type: Grant
    Filed: December 4, 1981
    Date of Patent: September 27, 1983
    Assignee: PPG Industries, Inc.
    Inventor: Henry M. Demarest, Jr.
  • Stain decorated glass-ceramic article
    Patent number: 3940531
    Abstract: A method for producing decorated glass-ceramic articles is disclosed. The method involves contacting a surface of a crystallizable glass with molten tin and thereafter applying to the tin-contacting surface a stain decorating composition. The article is then fired at a temperature such that the glass simultaneously crystallizes and the stain diffuses into the article to form the decoration.
    Type: Grant
    Filed: September 3, 1974
    Date of Patent: February 24, 1976
    Assignee: PPG Industries, Inc.
    Inventor: Henry M. Demarest, Jr.
  • Novel flat glass-producing furnace
    Patent number: 3936290
    Abstract: A novel tank-type furnace is disclosed for producing flat glass from a glass which has a high melting temperature and which contains highly volatile ingredients. The furnace has a tapered end wall construction leading from the melter into the canal. Such a construction results in the formation of better quality flat glass.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: February 3, 1976
    Assignee: PPG Industries, Inc.
    Inventors: Richard L. Cerutti, Henry M. Demarest, Jr.