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| Number | Title | Issue Date |
| 4679545 | Gas-fired outdoor spa and hot tub heater A heat exchanger unit for use with spas or hot tubs. The unit is constructed to be installed in a side wall of a portable spa or hot tub. The unit has an exposed front plate or panel, and the unit is constructed so as to limit the temperature to which thi... | 07/14/1987 |
| 4160476 | Securement of heat exchanger surfaces to tubes by lock seaming and method of fabrication Securement of flat heat exchange surfaces, particularly fins to tubular conduits of a heat exchanger. The heat exchange material is formed into upper and lower, or first and second pieces having longitudinal, partially circular recesses parallel to the le... | 07/10/1979 |
| 4158908 | Securement of heat exchanger surfaces to tubes and method of fabrication Securement of flat heat exchange surfaces, particularly fins to tubular conduits of a heat exchanger. The heat exchange material has longitudinal, partially circular recesses parallel to the length of a tube for engaging opposite sides of the tube. The ra... | 06/26/1979 |
| 3997107 | Servo modulating regulating control system A servo valve control system exemplified by way of temperature controlled gas valves. Multiple slave pressure regulating valves are utilized supplying multiple burner manifolds. The first valve of the group of valves is modulated in response to temperatur... | 12/14/1976 |
| 3992301 | Automatic flushing system for membrane separation machines such as reverse osmosis machines An automatic flushing and cleaning system for membrane separation machines such as reverse osmosis machines having plural modules or membranes. Cleaning may be by way of reducing the pressure to allow the membrane to relax, by the injection of air or iner... | 11/16/1976 |
| 3934906 | Means for coupling and sealing membrane carrying tube sections Porous, tubular core sections coated with a semipermeable membrane are joined at their ends by a simplified coupling member. Each coupling member or connector comprises a cylindrical flange member having circularly barbed or serrated nipples which fit tig... | 01/27/1976 |
