De-icing

• US 3,183,975 A
• Filed: 08/08/1963
• Issued: 05/18/1965
• Est. Priority Date: 08/09/1962
• Status: Expired due to Term

• Current Assignee: Raymond Keen John
• Original Assignee: Raymond Keen John
• Inventors: RAYMOND KEEN JOHN
• Application Number:
  US04/300,780
• Time in Patent Office: 649 Days
• US Class Current: 416/39
• CPC Class Codes: B64D 15/14 controlled cyclically along length of surface

Claims

1. DE-ICING EQUIPMENT COMPRISING A NUMBER OF INDIVIDUAL ELECTRICAL RESISTANCE HEATERS DISTRIBUTED OVER THE SURFACES FROM WHICH ICE IS TO BE REMOVED, MEANS FOR ENERGIZING THE HEATERS IN SEQUENCE IN A PREDETERMINED HEATING CYCLE, MEANS RESPONSIVE TO THE RATE OF ICING COUPLED TO INITIATE SAID PREDETERMINED HEATING CYCLES, AND TEMPERATURE SENSING MEANS RESPONSIVE TO THE AMBIENT TEMPERATURE TO DETERMINE THE DWELL TIME DURING WHICH EACH INDIVIDUAL HEATER IS OPERATIVE AS A FUNCTION OF THE TEMPERATURE SENSED.

3. A HELICOPTER HAVING ROTOR BLADES AND EQUIPMENT AS DEFINED IN CLAIM 1 FOR CONTROLLING DE-ICING OF THE HELICOPTER'"'"''"'"'S MAIN AND TAIL ROTOR BLADES IN WHICH INDIVIDUAL HEATERS ARE DISTRIBUTED OVER THE ROTOR BLADES, IN WHICH THE MAIN ROTOR HAS SOME OF THE HEATERS DISTRIBUTED OVER ITS BLADES AND MEANS FOR ENERGIZING THEM IN TURN, AND IN WHICH THE TALL ROTOR HAS A HEATER AND MEANS FOR ENERGIZING IT ONLY WHEN CERTAIN OF THE HEATERS ON THE MAIN ROTOR ARE BEING ENERGIZED.