Patents by Inventor Bonnie Greenstein

Bonnie Greenstein 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).

  • Calculator
    Patent number: 6015224
    Abstract: A calculator, comprising a keyboard having keys, each key having tactile symbols which indicate in Braille the numeral or function that the key represents. The calculator communicates its calculated numerical results visually, audibly, and tactiley. The tactile indication provides the result by a series of counting pulses, which represent the numerals in the result, the numerals separated by numerals spaces. The speed that the result is tactiley communicated is controllable by the user.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: January 18, 2000
    Inventor: Bonnie Greenstein