Patents by Inventor Harold Porosoff

Harold Porosoff 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).

  • Rigid polyurethane and polyisocyanurate foams
    Patent number: 5102923
    Abstract: Novel rigid polyurethane and/or polyisocyanurate foams are disclosed which have fine cell structure, low K-factor, and flame retardance. These foams are prepared by the reaction of a polyisocyanate with heterocyclic nitrogen containing polybeta-hydroxy urethane functional polyols which act as chemically bound flame retardants. Also disclosed are novel modified poly-beta-hydroxyalkyl carbamylalkylated heterocyclic nitrogen containing polyols useful for the formation of rigid foams.
    Type: Grant
    Filed: January 14, 1991
    Date of Patent: April 7, 1992
    Assignee: American Cyanamid Company
    Inventors: Harold Porosoff, Balwant Singh, Kurt C. Frisch
  • Melt-spinning acrylonitrile polymer fiber from low molecular weight polymers
    Patent number: 4219523
    Abstract: Acrylonitrile polymers having number average molecular weights in the range of about 6,000 up to about 15,750 provide fiber of desirable properties when melt-spun as a fusion melt with water.
    Type: Grant
    Filed: August 30, 1978
    Date of Patent: August 26, 1980
    Assignee: American Cyanamid Company
    Inventor: Harold Porosoff
  • Melt-spinning acrylonitrile polymer fibers
    Patent number: 4163770
    Abstract: A single phase fusion melt of an acrylonitrile polymer and water is extruded into a steam-pressurized solidification zone maintained under conditions such that the continuous filament resulting retains sufficient plasticity so that stretching can be effected at a stretch ratio of at least about 25 relative to the linear speed of the single phase fusion melt through the spinnerette.
    Type: Grant
    Filed: August 30, 1978
    Date of Patent: August 7, 1979
    Assignee: American Cyanamid Company
    Inventor: Harold Porosoff