Patents by Inventor Robert D. Stevens

Robert D. Stevens 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).

  • Fluorescently labeled microbeads
    Patent number: 4699826
    Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: October 13, 1987
    Assignee: Becton, Dickinson and Company
    Inventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
  • Fluorescently labeled microbeads
    Patent number: 4698262
    Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: October 6, 1987
    Assignee: Becton, Dickinson and Company
    Inventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
  • Method of preparing fluorescently labeled microbeads
    Patent number: 4609689
    Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: September 2, 1986
    Assignee: Becton, Dickinson and Company
    Inventors: Abraham Schwartz, Joel Williams, Robert D. Stevens
  • Product drying apparatus
    Patent number: 4134216
    Abstract: An apparatus for removing moisture from a moisture containing product in which the improvement consists of removing latent heat from the moisture removed from the product and reintroducing the latent heat as sensible heat to heat the air stream which is used to remove the moisture from the product, thus providing a continuous closed cycle drying process which includes its own heat supply.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: January 16, 1979
    Inventor: Robert D. Stevens