Patents by Inventor Philip H. Ravenscroft

Philip H. Ravenscroft 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).

  • Additive-containing fibers
    Patent number: 4055702
    Abstract: Additives can be permanently incorporated into melt spun fibers by cold drawing the fibers under conditions that generate a network of interconnecting microvoids within the fiber. The microvoids are formed in the presence of specified liquid or vapor media which fill the microvoid network. The temperature of the medium is below the effective glass transition temperature of the fibers containing said medium. The additive is either present in said medium or is applied to drawn fibers containing said medium.
    Type: Grant
    Filed: December 2, 1975
    Date of Patent: October 25, 1977
    Assignee: M & T Chemicals Inc.
    Inventors: Roger T. Guthrie, Justin L. Hirshman, Stanley Littman, Edwin L. Sukman, Philip H. Ravenscroft
  • Method for permanently and uniformly incorporating an additive into an undrawn fiber
    Patent number: 4001367
    Abstract: Additives can be permanently incorporated into melt spun fibers by cold drawing the fibers under conditions that generate a network of interconnecting microvoids within the fiber. The microvoids are formed concurrently with the drawing of the fiber in a non-solvent liquid or vapor media, which media fills the microvoid network. The temperature of the medium is below the effective glass transition temperature of the fibers containing said medium. The additive is either present in said medium or is applied to drawn fibers containing said medium.
    Type: Grant
    Filed: November 7, 1974
    Date of Patent: January 4, 1977
    Assignee: M & T Chemicals Inc.
    Inventors: Roger T. Guthrie, Justin L. Hirshman, Stanley Littman, Edwin L. Sukman, Philip H. Ravenscroft