Patent ID: 7471884

Claim:
Resistance-heated ceramic vaporizer boat ( 10 ) comprising an elongated vaporizer body made of homogeneous ceramic material and having an upper side surface ( 1 ) and plane lateral side surfaces ( 3 ) which are non-parallel to each other, each of said lateral side surfaces ( 3 ) is inclined to enclose an angle of 45° with the upper side surface ( 1 ), wherein the vaporizer body is formed in a generally trapezoidal cross-section so that the vaporizer body has a lower side surface ( 2 ) which is parallel to the upper side surface ( 1 ) and the ratio between the width of the upper side surface ( 1 ) and the height of the vaporizer body as measured between the upper side surface and the lower side surface ( 2 ) is greater than 2:1.