EP 0563374 A4 19940223 -
Publication
Application
Priority
US 78097791 A 19911023
Abstract (en)
[origin: WO9308668A1] A dual plate heater (2) provides two parallel temperature self-regulating heater plates (6, 8) or wire mesh comprising ferromagnetic material with one or more electrically energized coils (4) parallel to and located between the heater plates (6, 8) which coil(s) (4) when energized by a constant current (14) or by an otherwise controlled current heat the plates to their Curie temperature or temperatures. The coil may be a flat spiral of thin conductive (copper) wire (4) embedded in a thin layer of a heat conductive, electrically non-conductive material (14) between said plates whereby heat energy generated in the coil is supplied to the heater plates (6, 8). The dual plate heater (2) may be employed to heat plastic pipes (Fig. 14) to their butt welding temperatures after which the heater is removed and the ends of the pipes to be joined are brought into contact under pressure. The dual plate heaters may also be employed in other arrangements such as shelves (Fig. 15) in a dispensing machine.
IPC 1-7
IPC 8 full level
B29C 65/32 (2006.01); B29C 65/20 (2006.01); F16L 47/02 (2006.01); H05B 6/06 (2006.01); H05B 6/10 (2006.01); H05B 6/12 (2006.01); H05B 6/14 (2006.01); H05B 6/36 (2006.01); B29L 23/00 (2006.01)
CPC (source: EP)
B29C 65/2015 (2013.01); B29C 65/32 (2013.01); B29C 65/7841 (2013.01); B29C 66/0042 (2013.01); B29C 66/1142 (2013.01); B29C 66/5221 (2013.01); B29C 66/80 (2013.01); B29C 66/8122 (2013.01); B29C 66/81261 (2013.01); B29C 66/81821 (2013.01); B29C 66/81871 (2013.01); B29C 66/861 (2013.01); H05B 6/362 (2013.01); B29C 66/5224 (2013.01); B29K 2995/0008 (2013.01); B29L 2023/22 (2013.01)
Citation (search report)
- [X] DE 957148 C 19570131 - GUENTHER SUCHY
- [A] EP 0250094 A1 19871223 - METCAL INC [US]
- [A] R. B. JABLONSKI: "INDUCTIVE HEATING OF FLUIDS", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 14, no. 10, 1 March 1972 (1972-03-01), NEW YORK.;US, pages 3174
- See references of WO 9308668A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9308668 A1 19930429; CA 2096725 A1 19930424; CA 2096725 C 19980407; EP 0563374 A1 19931006; EP 0563374 A4 19940223; JP 2662616 B2 19971015; JP H06503206 A 19940407
DOCDB simple family (application)
US 9209154 W 19921023; CA 2096725 A 19921023; EP 92924135 A 19921023; JP 50795493 A 19921023