Patents Assigned to Blue M Electric Company
  • Temperature-controlled oven
    Patent number: 3977387
    Abstract: Inherent heating of the air in an oven by a high-velocity recirculating blower is used as constant rate thermal energy source. Constant temperature is maintained by varying the rate of blending of source of cooler air with the heated oven air. Automatic control of temperature is provided by a variable vent operated by a thermal expansion bellows, and a second control means is employed to prevent the oven from exceeding an adjustable maximum temperature.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: August 31, 1976
    Assignee: Blue M Electric Company
    Inventor: Joseph A. Lawler
  • Temperature controlled oven
    Patent number: 3958552
    Abstract: Inherent heating of the air in an oven by a high-velocity recirculating blower is used as constant rate thermal energy source. Constant temperature is maintained by varying the rate of blending of source of cooler air with the heated oven air. Automatic control of temperature is provided by a variable vent operated by a thermal expansion bellows. The bellows is slightly responsive to ambient temperature to compensate for variations thereof.
    Type: Grant
    Filed: April 24, 1974
    Date of Patent: May 25, 1976
    Assignee: Blue M Electric Company
    Inventor: Joseph A. Lawler