Patents by Inventor Hendrik Willem DIJKMAN

Hendrik Willem DIJKMAN 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: 11490740
    Abstract: The invention pertains to a method of monitoring the quality of a mattress during its lifetime, wherein the mattress is an assembly of multiple separate parts, wherein the parts are mechanically interconnected, the method comprising during its lifetime, assessing at least one property of the mattress, determining whether or not the property meets a predetermined specification, and when the property does not meet the predetermined specification, identifying a part of the said multiple separate parts that corresponds to the property, removing the identified part from the assembly and optionally replacing the removed part with a replacement part, wherein the mattress that is monitored is manufactured by forming the mechanical interconnection with an adhesive, which adhesive has a first order phase-transition temperature between 80° C. and 180° C.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: November 8, 2022
    Assignee: COVESTRO (NETHERLANDS) B.V.
    Inventors: Alwin Papegaaij, Geert Doorlag, Hendrik Willem Dijkman, Jan Henderikus Udding
  • Publication number: 20210368999
    Abstract: The invention pertains to a method of monitoring the quality of a mattress during its lifetime, wherein the mattress is an assembly of multiple separate parts, wherein the parts are mechanically interconnected, the method comprising during its lifetime, assessing at least one property of the mattress, determining whether or not the property meets a predetermined specification, and when the property does not meet the predetermined specification, identifying a part of the said multiple separate parts that corresponds to the property, removing the identified part from the assembly and optionally replacing the removed part with a replacement part, wherein the mattress that is monitored is manufactured by forming the mechanical interconnection with an adhesive, which adhesive has a first order phase-transition temperature between 80° C. and 180° C.
    Type: Application
    Filed: July 29, 2019
    Publication date: December 2, 2021
    Inventors: Alwin PAPEGAAIJ, Geert DOORLAG, Hendrik Willem DIJKMAN, Jan Henderikus UDDING