Patents Assigned to Dart Industries
  • Dissolution of metals utilizing .epsilon.-caprolactam
    Patent number: 4437930
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of .epsilon.-caprolactam.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: March 20, 1984
    Assignee: Dart Industries Inc.
    Inventor: Kwee C. Wong
  • Dissolution of metals utilizing pyrrolidone
    Patent number: 4437929
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of pyrrolidone such as 2-pyrrolidone or N-methyl-2-pyrrolidone.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: March 20, 1984
    Assignee: Dart Industries Inc.
    Inventor: Kwee C. Wong
  • Dissolution of metals utilizing a lactone
    Patent number: 4437927
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of a lactone such as .gamma.-butyrolactone, .epsilon.-caprolactone or .gamma.valerolactone.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: March 20, 1984
    Assignee: Dart Industries Inc.
    Inventor: Kwee C. Wong
  • Dissolution of metals utilizing a furan derivative
    Patent number: 4437932
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of a furan derivative such as tetrahydrofurfuryl alcohol or tetrahydrofuran.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: March 20, 1984
    Assignee: Dart Industries Inc.
    Inventor: Kwee C. Wong
  • Dissolution of metals
    Patent number: 4437931
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and certain primary diols.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: March 20, 1984
    Assignee: Dart Industries Inc.
    Inventors: Moenes L. Elias, Walter L. Burger
  • Picture frame arrangement
    Patent number: 4432152
    Abstract: A picture frame arrangement which contemplates employing a modular concept. Accordingly, a multiplicity of frames of the same or varying sizes may be arranged and interlocked together to create a desired picture collage. To achieve the interengagement between frames a unique hanger/holder has been conceived that overlies portions of the frames back surface and by means of a press-fit with integrally molded webs protruding from the mentioned frame back surfaces. The hanger/holder is further contemplated to be similarly attachable to a single frame or collage as a wall mounting or stand for the arrangement. Furthermore, each frame is provided with a reversible window that, in either position, press-fits into engagement with the frame's frontal surface to selectively retain either a typically thin picture or thicker collector type items.
    Type: Grant
    Filed: February 3, 1981
    Date of Patent: February 21, 1984
    Assignee: Dart Industries Inc.
    Inventor: Robert H. C. M. Daenen
  • Tungsten alloys containing A15 structure and method for making same
    Patent number: 4427445
    Abstract: A hard fine-grained internally stressed material of tungsten and carbon or tungsten, carbon and oxygen is described which is produced by thermochemical deposition. The material consists primarily of a two phase mixture of pure tungsten and an A15 structure, is free of columnar grain distribution, and has a hardness of greater than 1,200 VHN. The average grain size is less than 0.1 micron.
    Type: Grant
    Filed: July 21, 1982
    Date of Patent: January 24, 1984
    Assignee: Dart Industries, Inc.
    Inventors: Robert A. Holzl, Robert E. Benander, Robert D. Davis
  • Tiered serving dish or the like
    Patent number: D272212
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: January 17, 1984
    Assignee: Dart Industries Inc.
    Inventors: Robert H. C. M. Daenen, Rita Goyens-Daenen
  • Food storage cup or cover or the like
    Patent number: D272213
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: January 17, 1984
    Assignee: Dart Industries Inc.
    Inventor: Robert H. C. M. Daenen
  • Serving dish or the like
    Patent number: D272217
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: January 17, 1984
    Assignee: Dart Industries Inc.
    Inventors: Robert H. C. M. Daenen, Rita Goyens-Daenen
  • Drainer tray or the like
    Patent number: D272222
    Type: Grant
    Filed: June 18, 1981
    Date of Patent: January 17, 1984
    Assignee: Dart Industries Inc.
    Inventor: Kazunobu Cho
  • Closured food storage cup or the like
    Patent number: D272223
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: January 17, 1984
    Assignee: Dart Industries Inc.
    Inventor: Robert H. C. M. Daenen
  • Jug or the like
    Patent number: D272225
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: January 17, 1984
    Assignee: Dart Industries Inc.
    Inventor: Pieter K. J. DeCoster
  • Bread serving tray or the like
    Patent number: D272505
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: February 7, 1984
    Assignee: Dart Industries Inc.
    Inventors: Robert H. C. M. Daenen, Pieter K. J. De Coster
  • Canister jar and closure
    Patent number: D272507
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: February 7, 1984
    Assignee: Dart Industries Inc.
    Inventor: Rino Conti
  • Canister jar or the like
    Patent number: D272508
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: February 7, 1984
    Assignee: Dart Industries Inc.
    Inventor: Rino Conti
  • Combined corn butterer and salt dispenser
    Patent number: D272796
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: February 28, 1984
    Assignee: Dart Industries Inc.
    Inventor: Martin J. Wolff
  • Sifter or the like
    Patent number: D272972
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: March 13, 1984
    Assignee: Dart Industries Inc.
    Inventor: Pieter K. J. De Coster
  • Combined sifter and container or the like
    Patent number: D272973
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: March 13, 1984
    Assignee: Dart Industries Inc.
    Inventor: Pieter K. J. De Coster
  • Buffet server
    Patent number: D272978
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: March 13, 1984
    Assignee: Dart Industries Inc.
    Inventors: Dan E. Gremponrez, David L. Painter