| 摘要 |
1521858 Resistance heating element DAVID PARR & ASSOCIATES Ltd 23 June 1977 26298/77 Heading H5H A heater unit for attachment to a surface, e.g. a vehicle window, of the type comprising a plurality of resistance heating strips 11 provided with adhesive on corresponding surfaces thereof for attachment to the surface, an adhesive coated releasable backing sheet 13, to which the strips 11 are adhered, and a removable cover sheet 15 secured to the adhesive coating 14 on the backing sheet 13, is characterized by the provision of grooves or channels in the backing sheet 13 or cover sheet 15 which are in register with the heating strips 11 and designed to ensure that the adhesive surfaces of the heating strips 11 are spaced from the releasable cover sheet 15. |
