Patents by Inventor David Calvin Bradford

David Calvin Bradford 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).

  • Patent number: 7413849
    Abstract: Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides substituted benzene solvents suitable for use in the development of photopolymer printing plates. The solvents, which include substituted benzene alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: August 19, 2008
    Assignee: Nupro Technologies
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Publication number: 20080128368
    Abstract: The present invention relates to an improved method for reclaiming and recycling developing solvents used in the production of flexographic printing plates. More specifically, the invention relates to reclaiming and/or recycling of the developing solvent through centrifugation and/or filtration. According to the invention, the solvent used in developing printing plates can be reclaimed and/or recycled by simply centrifuging the polymer-contaminated solvent. In certain embodiment, the centrifuged solvent is further filtered. The process involves transferring the contaminated solvent, from a plate processor or a dirty holding tank, to a centrifuge, and centrifuging the contaminated solvent to remove the polymer. The reclaimed solvent can be transfer directly back to the plate processor or to a clean holding tank.
    Type: Application
    Filed: February 4, 2008
    Publication date: June 5, 2008
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Patent number: 7326353
    Abstract: The present invention relates to an improved method for reclaiming and recycling developing solvents used in the production of flexographic printing plates. More specifically, the invention relates to reclaiming and/or recycling of the developing solvent through centrifugation and/or filtration. According to the invention, the solvent used in developing printing plates can be reclaimed and/or recycled by simply centrifuging the polymer-contaminated solvent. In certain embodiment, the centrifuged solvent is further filtered. The process involves transferring the contaminated solvent, from a plate processor or a dirty holding tank, to a centrifuge, and centrifuging the contaminated solvent to remove the polymer. The reclaimed solvent can be transfer directly back to the plate processor or to a clean holding tank.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: February 5, 2008
    Assignee: Nupro Technologies
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Patent number: 6897008
    Abstract: Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides terpene ether solvents suitable for use in the development of photopolymer printing plates. The solvents, which include terpene ethers alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: May 24, 2005
    Assignee: NuPro Technologies, Inc.
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Publication number: 20040142282
    Abstract: Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides alkyl ester solvents suitable for use in the development of photopolymer printing plates. The solvents, which include alkyl esters alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
    Type: Application
    Filed: November 6, 2003
    Publication date: July 22, 2004
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Publication number: 20040091824
    Abstract: The present invention provides methods of reclaiming and recycling the polymer-contaminated solvent that was used in the developing process for the preparation of relief plates crosslinked by photopolymerization. The solvent of the present system contains alkyl esters, alone or in combination with co-solvents and/or non-solvents, as washout solvents for the unpolymerized material in the printing plates to develop a relief image and a method for developing printing plates. The process comprises transferring the contaminated solvent, from a plate processor or a dirty holding tank, to a centrifuge, and centrifuging the contaminated solvent to remove the polymer. The reclaimed solvent can be transfer directly back to the plate processor or to a clean holding tank.
    Type: Application
    Filed: July 28, 2003
    Publication date: May 13, 2004
    Inventors: David Calvin Bradford, Constance Marie Hendrickson
  • Publication number: 20030198900
    Abstract: Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides methyl ester solvents suitable for use in the development of photopolymer printing plates. The solvents, which include methyl esters alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
    Type: Application
    Filed: May 14, 2003
    Publication date: October 23, 2003
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Patent number: 6582886
    Abstract: Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides methyl ester solvents suitable for use in the development of photopolymer printing plates. The solvents, which include methyl esters alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: June 24, 2003
    Assignee: NuPro Technologies, Inc.
    Inventors: Constance Marie Hendrickson, David Calvin Bradford
  • Publication number: 20030104315
    Abstract: Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides methyl ester solvents suitable for use in the development of photopolymer printing plates. The solvents, which include methyl esters alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
    Type: Application
    Filed: November 27, 2001
    Publication date: June 5, 2003
    Inventors: Constance Marie Hendrickson, David Calvin Bradford