Icing indicator system

• US 3,229,271 A
• Filed: 02/27/1962
• Issued: 01/11/1966
• Est. Priority Date: 02/27/1962
• Status: Expired due to Term

• Current Assignee: Martin S. Frant
• Original Assignee: Martin S. Frant
• Inventors: Frant, Martin S.
• Application Number:
  US04/176,154
• Time in Patent Office: 1,414 Days
• US Class Current: 340/581
• CPC Class Codes: G01W 1/14 Rainfall or precipitation gauges measuring volume in general G01F
• CPC Class Codes: G08B 19/02 Alarm responsive to formation or anticipated formation of ice
• CPC Class Codes: G08B 21/00 Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for

Claims

1. AN ICING INDICATOR SYSTEM COMPRISING A THERMOELECTRIC COOLER HAVING A POLISHED MIRROR-LIKE SURFACE, A SOURCE OF LIGHT ADAPTED TO DIRECT A BEAM OF LIGHT THEREON AND A PHOTOCELL ACTIVATED BY THE REFLECTED LIGHT, A DIFFERENTIAL THERMOCOUPLE FORMING A JUNCTION CONTACT AT ONE END WITH SAID SURFACE AND HAVING ITS OTHER END EXPOSED TO THE ATMOSPHERE, A THERMOMETRIC SWITCH EXPOSED TO THE ATMOSPHERE, ACTUATABLE BELOW A PREDETERMINED TEMPERATURE AND CONNECTED INTO SAID THERMOCOUPLE, A VOLTAGE DETECTIN CIRCUIT ELECTRICALLY CONNECTED TO SAID THERMOCOUPLE, A RELAYOPERATED SWITCH CONNECTED TO SAID CIRCUIT AND TO A SOURCE OF POWER AND A WARNING SIGNAL ELECTRICALLY CONNECTED TO SAID RELAY-OPERATED SWITCH AND ACTUATED BY SAID SYSTEM WHEN SAID RELAY-OPERATED SWITCH AND SAID THERMOMETRIC SWITCH ARE CLOSE DUE TO EXISTING TEMPERATURE AND DEWPOINT CONDITIONS WHICH ARE CONDUCTIVE TO ICING.