Abstract: The present invention relates to the technical field of fluid heater devices, and more particularly to an electric immersion heater for use in electro-plating, metal preparation, finishing applications in the electronics industry (e.g. preparation of printed circuits). The invention more specifically provides a new and improved electric immersion heater design that includes, in combination, a unique flexible cable structure enabling small diameter coils (made primarily from a fluoroplastic material) which, in turn, are mounted on a support frame structure. This provides an inexpensive heater assembly that has optimum heat transfer capability in liquid treating mediums.

Abstract: The present invention relates to the technical field of fluid heater devices, and more particularly to an electric cable structure of a composite construction adapted for use as an electric immersion heater for use in electroplating, metal preparation and finishing applications and the like, and more particularly relates to a new and novel, flexible cable structure of small diameter which can be quickly and easily produced by continuous fabricating techniques into indefinite lengths, and which may be thereafter severed into predetermined lengths for various immersion heater applications.

Abstract: There is disclosed liquid level responsive control means for use with heating means for liquid in tanks comprising a control unit, main power supply connections therefore, a source of radiant energy to be immersed in the liquid being heated, sensing instrumentalities closely adjacent said source, said instrumentalities including a recycling bi-metal switch operable at a predetermined temperature produced by the source aforesaid, and a non-recycling or fuse element connected in series with the said switch and operable at a higher temperature, connections from the control unit to supply power to the radiant energy source and connections to the sensing instrumentalities and to the tank heating means.