Patents by Inventor Howard P. Aldrich

Howard P. Aldrich 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).

  • Control alternating system
    Patent number: 4164896
    Abstract: A cabin pressure control system has two independent controllers, one of which is used as primary controller while the other serves as standby. On alternate flights the identity of primary and standby controller are switched so that both controllers will be regularly utilized.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: August 21, 1979
    Assignee: The Garrett Corporation
    Inventor: Howard P. Aldrich
  • Mode indication system
    Patent number: 4164895
    Abstract: A cabin pressure control system has two independent controllers, one of which is the primary controller and the other the standby controller taking control in case of primary controller malfunction. The controllers switch roles automatically each flight. An annunciating system indicates the identity of the primary controller on the previous flight and maintains the designation in case of malfunction so that a defective unit may be readily identified.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: August 21, 1979
    Assignee: The Garrett Corporation
    Inventors: Howard P. Aldrich, Glenn A. Burgess, Clarence T. Yamanaka
  • Control schedule linearization system
    Patent number: 4164897
    Abstract: An aircraft cabin pressure control system regulates cabin pressure as a function of outside ambient pressure in accordance with the equation ##EQU1## WHERE K.sub.1, K.sub.2 and K.sub.3 are constants, P.sub.a is atmospheric pressure, and P.sub.c is the desired value of regulated cabin pressure.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: August 21, 1979
    Assignee: The Garrett Corporation
    Inventors: Howard P. Aldrich, Clarence T. Yamanaka, Glenn A. Burgess
  • Flow annunciation system
    Patent number: 4164900
    Abstract: In a cabin pressure control system having primary and standby controllers, control is switched from the primary to standby upon occurrence of a malfunction which prevents the primary controller from maintaining pressurization properly. If failure is a result of insufficient inflow of pressurized air of excessive leakage, transfer is prevented and the problem is annunciated to the crew.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: August 21, 1979
    Assignee: The Garrett Corporation
    Inventor: Howard P. Aldrich