Patents by Inventor Philip C. Shaw, Jr.

Philip C. Shaw, Jr. 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).

  • PTC circuit protection device and manufacturing process for same
    Patent number: 5955936
    Abstract: Electrical devices having a PTC element of a polymer having conductive particles dispersed therein. The PTC element is coated with a conductive layer and has electrodes with a plurality of voids affixed to opposing surfaces. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The polymer PTC composition is melt-shaped to form a laminar shaped PTC element. First and second opposing surfaces of the PTC element are coated with a conductive layer. The electrodes, characterized by a plurality of voids and made of foam, are brought into contact with the coated surfaces of the PTC element, and heated while applying pressure to form a laminate. The laminate is then further shaped into a plurality of PTC electrical circuit protection devices.
    Type: Grant
    Filed: May 20, 1997
    Date of Patent: September 21, 1999
    Assignee: Littlefuse, Inc.
    Inventors: Philip C. Shaw, Jr., Donna L. Randle, Michael J. Weber, Michael J. Hoss, Tom J. Hall
  • Method of manufacturing a PTC circuit protection device
    Patent number: 5940958
    Abstract: Electrical devices comprising a PTC element comprised of a polymer having conductive particles dispersed therein. The PTC element is coated with a conductive layer and has electrodes with a plurality of voids affixed to opposing surfaces. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The polymer PTC composition is melt-shaped to form a laminar shaped PTC element. First and second opposing surfaces of the PTC element are coated with a conductive layer. The electrodes, characterized by a plurality of voids, are brought into contact with the coated surfaces of the PTC element, and heated while applying pressure to form a laminate. The laminate is then further shaped into a plurality of PTC electrical circuit protection devices.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: August 24, 1999
    Assignee: Littlefuse, Inc.
    Inventors: Philip C. Shaw, Jr., Donna L. Randle, Michael J. Weber, Michael J. Hoss, Tom J. Hall
  • PTC electrical device having fuse link in series and metallized ceramic electrodes
    Patent number: 5663702
    Abstract: Electrical devices with a PTC element including a polymer having conductive particles dispersed therein and at least one metallized ceramic electrode. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The metallized ceramic electrodes include a ceramic substrate having a conductive layer deposited on its surface. The metallized ceramic electrodes are brought into contact with the PTC element, and heated while applying pressure to form a laminate. The laminate is then diced into a plurality of PTC electrical circuit protection devices.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 2, 1997
    Assignee: Littelfuse, Inc.
    Inventors: Philip C. Shaw, Jr., Paul Charles Stein