Patents by Inventor Dieter Hendriks

Dieter Hendriks 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).

  • Magnetic developers and process for their preparation
    Patent number: 4391893
    Abstract: Developers consisting of virtually spherical particles made by spray drying an aqueous dispersion of a magnetic substance and a coating material consisting of polymers or waxes or of a mixture of polymers with a wax and/or a plasticizer, their constituents being preferably water-dispersible, and process for their preparation.
    Type: Grant
    Filed: October 30, 1980
    Date of Patent: July 5, 1983
    Assignee: Sublistatic Holding, S.A.
    Inventor: Dieter Hendriks
  • Process for formation of permanent image
    Patent number: 4251611
    Abstract: The present invention relates to electrophotography, and in particular to the formation of a permanent image in one or more colors from latent electrostatic images which correspond to the color separations of an original and the developing of which is effected by means of a developer composed of polymer particles containing at least one dyestuff which can sublime or vaporize at between 100.degree. and 250.degree. C. The recording is effected under dry conditions by vaporization or sublimation of the dyestuffs present in the developers, without any fixing operation following the transfer of the dyestuffs onto the support which receives the recording.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: February 17, 1981
    Assignee: Sublistatic Holding SA
    Inventors: Wolfgang Mehl, Dieter Hendriks, Robert Decombe
  • Magnetic toners and development process
    Patent number: 4251616
    Abstract: Dry developer for the development of electrophotographic latent images, consisting of a single type of very fine particle containing an electrically conductive substance, a magnetic substance and a binder, characterized in that it has a high conductivity, greater than 10.sup.-2 Siemens cm, and in that this conductivity is independent of the value of the electrical field applied and its use in a process for development of electrophotographic latent images wherein it is applied from an insulating surface.
    Type: Grant
    Filed: June 23, 1977
    Date of Patent: February 17, 1981
    Assignee: Sublistatic Holding SA
    Inventor: Dieter Hendriks
  • Electrophotographic developers containing sublaminate dyes
    Patent number: 4246331
    Abstract: An electrophotographic developer is composed of particles comprising magnetic cores which are coated with an organic substance and at least one dyestuff which passes into the vapour state at a temperature in the range of from 100.degree. to 220.degree. C. at atmospheric pressure.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: January 20, 1981
    Assignee: Sublistatic Holding SA
    Inventors: Wolfgang Mehl, Dieter Hendriks
  • Developers containing magnetic particles and a sublimable dyestuff
    Patent number: 4145300
    Abstract: Developers containing a polymer and at least one sublimable or vaporizable dyestuff which, at atmospheric pressure, passes into the vapor state at between 100.degree. and 220.degree. C., and characterized in that they consist of particles containing a mixture of at least one polymer with a plasticizer or a wax, which release the vapors of said dyestuff if heated at the sublimation or vaporization temperature of said dyestuff, and process for their preparation.
    Type: Grant
    Filed: September 30, 1976
    Date of Patent: March 20, 1979
    Assignee: Sublistatic Holding S.A.
    Inventor: Dieter Hendriks