Patents by Inventor Rudolph A. Sauter

Rudolph A. Sauter 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).

  • Patent number: 5148468
    Abstract: A door answering system is described for enabling the occupant of a structure (e.g., house, apartment, etc.) to provide a pre-recorded message to a visitor who has approached the entrance of the structure. The system includes a speaker/microphone and a call switch at the entrance for the visitor. Inside the structure there is a recorder/player for playing a pre-recorded message and recording a message left by the visitor.
    Type: Grant
    Filed: October 24, 1990
    Date of Patent: September 15, 1992
    Inventors: Paul J. T. Marrick, Gregory J. Arnold, Rudolph A. Sauter