Patents by Inventor Chi Fang Tung

Chi Fang Tung 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).

  • Helmets and other articles reflectorized with retroreflective platelet particles
    Patent number: 4100625
    Abstract: Helmets and other articles are made reflective through the use of coatings which include retroreflective platelet particles cut from a larger retroreflective sheeting.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: July 18, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Chi Fang Tung
  • Internally illuminated retroreflective signs
    Patent number: 4005538
    Abstract: Internally illuminated signs incorporating light-transmissive retroreflective sheeting between the internal illumination source and the sign face in position to retroreflect light beamed against the sign face so as to make the signs retroreflective. Preferred sheeting comprises an open web of filaments encased by retroreflective microspheres.
    Type: Grant
    Filed: August 29, 1975
    Date of Patent: February 1, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Chi Fang Tung
  • Fluid composition for forming retroreflective structures
    Patent number: 4004930
    Abstract: A fluid composition useful to form retroreflective structures, comprising a liquid vehicle and, dispersed in said vehicle, retroreflective platelet particles that comprise flat segments cut from a larger retroreflective sheeting.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: January 25, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Chi Fang Tung
  • Transparent glass microspheres and products made therefrom
    Patent number: 3946130
    Abstract: Transparent glass microspheres that are based on a ternary system of TiO.sub.2, heavy-metal oxide selected from BaO and CdO, and strong glass-forming oxide selected from SiO.sub.2, P.sub.2 O.sub.5, and GeO.sub.2 are disclosed. The microspheres have improved uniformity in optical properties and in handling properties, whereby retroreflective products of greater retroreflectivity can be made.
    Type: Grant
    Filed: April 1, 1974
    Date of Patent: March 23, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Chi Fang Tung, James A. Laird
  • Retroreflective sheet material
    Patent number: 3934065
    Abstract: A new retroreflective sheet material is taught that comprises a light-transmissive retroreflective open web of filaments that are individually encased by a monolayer of minute retroreflective microspheres, the web being ensheathed within an envelope that comprises two overlaid sheets joined together around the edge of the envelope, at least one of the sheets being transparent.
    Type: Grant
    Filed: August 1, 1973
    Date of Patent: January 20, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Chi Fang Tung
  • Retroreflective protective helmet
    Patent number: RE29742
    Abstract: Protective helmets that give a distinctive retroreflective signal under wet or dry conditions at night or in other darkened environments are provided by disposing a retroreflective layer covered by a transparent layer over at least a major portion of the outer surface of the helmet.
    Type: Grant
    Filed: February 24, 1977
    Date of Patent: August 29, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Chi Fang Tung