Patents by Inventor David M. Cenedella

David M. Cenedella 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).

  • Controller for two-stage heat source, usable with single and two stage thermostats
    Patent number: 6230979
    Abstract: A controller for a two-stage heat source that can be used with a single stage or a two stage thermostat. The controller includes a second stage delay timer that initiates second stage heating when the timer is decremented to zero. The timer is reset when there is no longer a call for first stage heat, when there is a call for second stage heat, or if there is no call for second stage heat and the controller determines that it is connected to a two-stage thermostat. The controller can include an indicator such as a contact bar and jumper or a switch for indicating the type of thermostat connected to the controller. Alternatively, the controller can be programmed to “learn” whether it is attached to a single stage or two-stage thermostat, assuming that it is connected to a single stage thermostat, unless and until a call for second stage heating is received.
    Type: Grant
    Filed: January 20, 2000
    Date of Patent: May 15, 2001
    Assignee: Emerson Electric Co.
    Inventors: Stephen J. Vendt, William P. Butler, David M. Cenedella