Patents Assigned to Dart Industries
  • Dissolution of metals utilizing an aqueous H.sub.2 SO.sub.Y --H.sub.2 O.sub. -mercapto containing heterocyclic nitrogen etchant
    Patent number: 4236957
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of a heterocyclic nitrogen compound containing at least one free mercapto group substitution.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: December 2, 1980
    Assignee: Dart Industries Inc.
    Inventors: Silvester P. Valayil, Moenes L. Elias
  • Serving plate set or the like
    Patent number: 4234097
    Abstract: A serving plate set having two similar receptacles which in one form is separated by a sealing member that segregates the receptacle contents, such member also being of a plate-like configuration and which in another form employs the two receptacles to create a closured container.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: November 18, 1980
    Assignee: Dart Industries Inc.
    Inventor: Robert H. C. M. Daenen
  • Dissolution of metals utilizing an aqueous H.sub.2 O.sub.2 -H.sub.2 SO.sub.4 -thioamide etchant
    Patent number: 4233113
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of a thioamide having the general formula ##STR1## wherein R is an aryl or a heterocyclic group.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: November 11, 1980
    Assignee: Dart Industries Inc.
    Inventors: Silvester P. Valayil, Moenes L. Elias
  • Dissolution of metals utilizing an aqueous H.sub.2 SO.sub.4 -H.sub.2 O.sub.2 -3-sulfopropyldithiocarbamate etchant
    Patent number: 4233111
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of 3-sulfopropyldithiocarbamate sodium salt having the general formula ##STR1## wherein R can be a C.sub.1 -C.sub.4 alkyl group, phenyl, a C.sub.7 -C.sub.10 alkaryl group or a C.sub.7 -C.sub.10 aralkyl group.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: November 11, 1980
    Assignee: Dart Industries Inc.
    Inventors: Silvester P. Valayil, Moenes L. Elias
  • Dissolution of metals utilizing an aqueous H.sub.2 SO.sub.4 -H.sub.2 O.sub.2 -polysulfide etchant
    Patent number: 4233112
    Abstract: Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and a catalytic amount of a polysulfide compound having the general formula ##STR1## wherein R is a hydroxyl group, a carboxyl group, a sulfonic acid group or a sulfonic acid salt group, each X independently from each other can be hydrogen, hydroxyl or C.sub.1 -C.sub.4 alkyl, each Y independently from each other can be hydrogen, hydroxyl or C.sub.1 -C.sub.4 alkyl, m is an integer from 1 to 18, and n is an integer from 2 to 5.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: November 11, 1980
    Assignee: Dart Industries Inc.
    Inventors: Silvester P. Valayil, Moenes L. Elias
  • Non-chromate conversion coatings
    Patent number: 4225351
    Abstract: Improved brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate, certain primary organophosphorus compound promoters and at least one secondary promoter selected from ascorbic acid, boric acid, gluconic acid, glycolic acid, tartaric acid and salts of said acids.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventors: Richard F. Zuendt, Ajay M. Bengali, Philip D. Readio, John L. H. Allan
  • Non-chromate conversion coatings
    Patent number: 4225350
    Abstract: Improved color, brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate and at least one cationic triarylmethane dye. Certain organophosphorus compound additives further enhance the corrosion resistance.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventors: John L. H. Allan, Philip D. Readio, Ajay M. Bengali, Richard F. Zuendt
  • Polyolefin catalyst
    Patent number: 4222895
    Abstract: Phosphorus oxytrichloride modified titanium trichloride polymerization catalysts of improved efficiency and/or isotacticity are obtained when the modification reaction is carried out in the presence of methylene chloride.
    Type: Grant
    Filed: May 4, 1979
    Date of Patent: September 16, 1980
    Assignee: Dart Industries Inc.
    Inventors: John L. H. Allan, Birendra K. Patnaik
  • Non-chromate conversion coatings
    Patent number: 4222779
    Abstract: Improved brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide and a silicate. Certain organophosphorus and organonitrogen compound additives further enhance the corrosion resistance.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 16, 1980
    Assignee: Dart Industries Inc.
    Inventors: Ajay M. Bengali, Richard F. Zuendt, John L. H. Allan, Philip D. Readio
  • Covered dish
    Patent number: D256646
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: September 2, 1980
    Assignee: Dart Industries Inc.
    Inventors: David L. Painter, Robert C. Zinkgraf
  • Plate
    Patent number: D256756
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: September 9, 1980
    Assignee: Dart Industries Inc.
    Inventors: David L. Painter, Robert C. Zinkgraf
  • Food container or the like
    Patent number: D257107
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventors: Robert H. C. M. Daenen, Pieter K. J. De Coster
  • Dish or the like
    Patent number: D257108
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventor: Robert H. C. M. Daenen
  • Compartmented serving tray or the like
    Patent number: D257109
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventor: Rino Conti
  • Compartmented dish or the like
    Patent number: D257110
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventor: Rino Conti
  • Shelving unit or the like
    Patent number: D257195
    Type: Grant
    Filed: August 11, 1978
    Date of Patent: October 7, 1980
    Assignee: Dart Industries Inc.
    Inventors: James B. Swett, Rino Conti
  • Tray or the like
    Patent number: D257201
    Type: Grant
    Filed: August 11, 1978
    Date of Patent: October 7, 1980
    Assignee: Dart Industries Inc.
    Inventors: Jack V. Croyle, Robert F. Bateman
  • Pitcher
    Patent number: D257311
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: October 14, 1980
    Assignee: Dart Industries Inc.
    Inventors: David L. Painter, Robert C. Zinkgraf
  • Cream pitcher or the like
    Patent number: D257312
    Type: Grant
    Filed: May 16, 1979
    Date of Patent: October 14, 1980
    Assignee: Dart Industries Inc.
    Inventor: Rino Conti
  • Tea pot
    Patent number: D257313
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: October 14, 1980
    Assignee: Dart Industries Inc.
    Inventors: David L. Painter, Robert C. Zinkgraf