Patents by Inventor Warren A. Lederman

Warren A. Lederman 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: 4314578
    Abstract: A fluid signal inverting unit includes a motion balance unit having a lever which operates a valve. The balance lever is supported at the opposite ends by a pilot signal chamber and a feedback signal chamber and an intermediate pivot support is coupled to position a back pressure leakport valve. Each chamber includes an outer matched linear metal diaphragm fixedly connected to the aligned end of the lever. Increases in pilot pressure result in the outward movement of the linear diaphragm and corresponding outward and pivotal movement of the lever. The lever tends to move away from and open the valve resulting in a decrease in the output pressure and an inverted output pressure signal which may be further amplified and transmitted to a flow booster relay, and as negative feedback signal to the feedback chamber. Decrease in pilot pressure results in an opposite action and an increase output pressure.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: February 9, 1982
    Assignee: Johnson Controls, Inc.
    Inventor: Warren A. Lederman
  • Patent number: 4207914
    Abstract: A control valve includes a single diaphragm as a common wall between an input signal chamber having an input port and an output chamber having a central supply port and an exhaust orifice. The orifice has a seating face parallel to and spaced from the diaphragm. A spring-loaded ball valve unit in the supply passage is aligned with an operator moving with the diaphragm. An increasing input signal first moves the diaphragm to close the exhaust orifice and thereafter moves the operator to open the supply valve. Pressure builds in the output chamber, tending to return the diaphragm and close the supply valve until the output and pilot pressure are balanced. The supply valve then closes. As the exhaust is sealed off, this effectively seals the output chamber. If the signal decreases, the diaphragm uncovers the exhaust orifice until a new balanced state is created.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: June 17, 1980
    Assignee: Johnson Controls, Inc.
    Inventors: Thomas M. Holloway, George J. Janu, Richard N. Laakaniemi, Warren A. Lederman