Patents by Inventor Ralph Reginald Pearce

Ralph Reginald Pearce 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: 4104513
    Abstract: Magnetic recording media including permanent structures of aligned acicular particles have been proposed as a means of identifying and authenticating a medium. A structure which has an improved remanence difference signal is described. A method of making and examining such a structure is described. Arrangements of such media and record / read-out apparatus by which information can be recorded and read-out without interference from the structural remanence differences are described. The use of the media for security documents such as credit cards is described.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: August 1, 1978
    Assignee: E M I Limited
    Inventor: Ralph Reginald Pearce
  • Patent number: 4081132
    Abstract: A security document has a carrier and two layers of magnetizable material one overlying the other, the carrier and layers being all bonded together. One layer is for the recording of information and the other layer has a magnetic structure which can be examined for verification purposes. A preferred method of making the structured layer is to deposit magnetizable material to form the layer within the influence of a magnetic field from a recording on the information layer which is of the form of the structure. The recording is erased when the structured layer has been formed. The security document may be a credit card, a bank note or other valuable paper.
    Type: Grant
    Filed: October 22, 1974
    Date of Patent: March 28, 1978
    Assignee: E M I Limited
    Inventor: Ralph Reginald Pearce
  • Patent number: 3998160
    Abstract: A method of printing wherein magnetic particles dispersed in an ink are selectively orientated prior to printing onto a document where the particles are aligned on a carrier while the ink is in a low viscous state and the printing is effected when the ink is in a high viscous state. The method by which the viscosity is changed is the selective application of heat.
    Type: Grant
    Filed: April 16, 1975
    Date of Patent: December 21, 1976
    Assignee: EMI Limited
    Inventor: Ralph Reginald Pearce