Patents by Inventor Roger Davey

Roger Davey 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).

  • Pigment-based ink formulations having improved printhead lifetime
    Patent number: 11441044
    Abstract: An aqueous-based inkjet ink for a thermal inkjet printhead includes: a pigment; 2 to 90 ppm ammonium ions; and an ink vehicle. The ink has a pH in the range of 8 to 9.5 and exhibits improved lifetime in thermal inkjet printheads with minimal loss of print quality.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: September 13, 2022
    Inventors: Simon Fielder, Alison Chong, David Tyvoll, Tim Hudson, Roger Davey, Ellaine Munton
  • PIGMENT-BASED INK FORMULATIONS HAVING IMPROVED PRINTHEAD LIFETIME
    Publication number: 20200062981
    Abstract: An aqueous-based inkjet ink for a thermal inkjet printhead includes: a pigment; 2 to 90 ppm ammonium ions; and an ink vehicle. The ink has a pH in the range of 8 to 9.5 and exhibits improved lifetime in thermal inkjet printheads with minimal loss of print quality.
    Type: Application
    Filed: August 23, 2019
    Publication date: February 27, 2020
    Inventors: Simon Fielder, Alison Chong, David Tyvoll, Tim Hudson, Roger Davey, Ellaine Munton
  • Method of printing pigment-based inks including ink sets, inks and printers therefor
    Patent number: 9834694
    Abstract: A method of inkjet printing includes the steps of: printing a first ink onto a print medium, the first ink including a first self-dispersible pigment, the first ink having a first pigment content A; and subsequently printing a second ink onto the print medium at least partially over the first ink, the second ink including a second pigment and a polymeric dispersant encapsulating the second pigment, the second ink having a second pigment content B. The first self-dispersible pigment and the second pigment have a same color; the pigment content A of the first ink and the pigment content B of the overprinted second ink have a relationship 0.8?A/B?1.2; and a polymer acid value of the polymeric dispersant is in the range of 100 to 170.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: December 5, 2017
    Assignee: MEMJET TECHNOLOGY LIMITED.
    Inventors: Teruyuki Fukuda, Satoshi Tanaka, Adrian Bisson, Roger Davey, Richard Myors, Stephen Bernard, Philippa Read, Iain Blake, Steven Carter
  • METHOD OF PRINTING PIGMENT-BASED INKS INCLUDING INK SETS, INKS AND PRINTERS THEREFOR
    Publication number: 20150138271
    Abstract: A method of inkjet printing includes the steps of: printing a first ink onto a print medium, the first ink including a first self-dispersible pigment, the first ink having a first pigment content A; and subsequently printing a second ink onto the print medium at least partially over the first ink, the second ink including a second pigment and a polymeric dispersant encapsulating the second pigment, the second ink having a second pigment content B. The first self-dispersible pigment and the second pigment have a same color; the pigment content A of the first ink and the pigment content B of the overprinted second ink have a relationship 0.8?A/B?1.2; and a polymer acid value of the polymeric dispersant is in the range of 100 to 170.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 21, 2015
    Inventors: Teruyuki Fukuda, Satoshi Tanaka, Adrian Bisson, Roger Davey, Richard Myors, Stephen Bernard, Philippa Read, Iain Blake, Steven Carter