Patents by Inventor Michael B. Spring

Michael B. Spring 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).

  • Low battery detector
    Patent number: 5265271
    Abstract: An electronic device (100) operating on a battery voltage (126) is disclosed having a regulator (108) for producing a first reference voltage (106) and a second reference voltage (110). The electronic device (100) includes an A/D converter (114) for comparing the battery voltage (126) to the first reference voltage (106) to produce a first sample. The A/D converter (114) also compares the second reference voltage (110) to the first reference voltage (106) to produce a second sample. The two samples are then subtracted at a micro-computer (112) to produce a difference sample. The micro-computer (112) compares the difference sample to a first value and detects low battery conditions when the difference sample is below the first value.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: November 23, 1993
    Assignee: Motorola, Inc.
    Inventors: Paul D. Marko, Mark S. Stuglik, Michael B. Spring