Patents by Inventor Marion M. Braswell

Marion M. Braswell 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).

  • System for controlling ambient pressure within an enclosed environment
    Patent number: 5201830
    Abstract: The present invention provides a system for controlling ambient pressure within an enclosed environment. The system is comprised of means for outputting a first signal, generally of a predetermined value. That signal is received in a detecting and comparing means which determines the relative change in the signal over time. Based upon the determination of the signal change, a second signal is generated. The second signal is received by an active device which is capable of altering the ambient pressure within the enclosed environment and responds to the second signal.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: April 13, 1993
    Inventor: Marion M. Braswell