Patents by Inventor Ragnunatha S. Rao

Ragnunatha S. Rao 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).

  • Tubular electric lamp having a lamp base sleeve with an access port for securing a contact to a current-conductor
    Patent number: 5241239
    Abstract: A tubular electric lamp has lamp bases each consisting of an electrically insulative sleeve and conductive contact mounted therein. The sleeve has a first abutment which buts against the seal, a second abutment against which the conductive contact is seated, and an access port located axially between the first and second abutments. With the contact seated against the second abutment and the sleeve mounted over the current conductor and butted against the seal, the current conductor and a projection of the conductive contact extend axially past the access port. The conductive contact is welded and/or crimped to the conductive contact through the access port with the contact seated against the second abutment and the first abutment butted against the seal, fixing the sleeve between the contact and the seal.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: August 31, 1993
    Assignee: North American Philips Corporation
    Inventor: Ragnunatha S. Rao