(under subclass 57) Devices comprising (1) means for supporting a supply of fuel in the well or (2) a heated bar or container adapted to be lowered into the well after it is heated or filled with a hot material.
(1) Note. "Fuel" in this subclass is any material which is intended to enter into an exothermic chemical reaction in the
well.
SEE OR SEARCH THIS CLASS, SUBCLASS:
55, for pipe perforating, weakening bending or separating means involving exothermically reacting materials inserted in a well.
63, for explosive or gas generating means in a well in which the purpose of the explosion or gas generation is not to evolve heat, being usually to generate pressure or deliver a fracturing blow.
SEE OR SEARCH CLASS 126, Stoves and Furnaces, appropriate subclasses for heaters, especially
263.01+, for heaters, heating by reaction of chemicals in a container and not disclosed or claimed as only used in a well.
