Patents by Inventor Aldo Hefti

Aldo Hefti 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: 5293399
    Abstract: The proposed device is an identification system having an interrogator/receiver and a passive transponder. The interrogator/receiver includes a clock signal generator (1) a group of bandpass filters (5), a section to decode the data received, and an interrogator coil (4) for inductively coupling the interrogator/receiver to the transponder. The transponder includes a section (E) for picking up the power signal transmitted by the interrogator/receiver, a section (F) to codify the signal obtained according to a predetermined code stored in a memory (15), and a section (G) for phase modulating the codified data so as to allow air transmission. Particularly, the bandpass filters (5) are capable of detecting a frequency band width lower than one thousandth of the signal's frequency.
    Type: Grant
    Filed: December 8, 1991
    Date of Patent: March 8, 1994
    Assignee: R. Audemars SA
    Inventor: Aldo Hefti