Appeal No. 2005-0247 Page 8
Application No. 10/171,657
that Campbell's thermal drop-on-demand ink jet print head constitutes a "bubble-jet
type" ink jet print head. The reference's print head "comprises a suitable substrate
member 10, upon one surface 11 of which is formed an array of resistive heater
elements 12, only one of which is shown in FIGS. 1 and 2 of the drawings." Col. 2,
ll. 49-52. "A second substrate 18 is fixed in position adjacent to substrate 10 so that a
nozzle 19 is opposite each of the resistive heating elements 12. Substrate 18 is shaped
to provide an ink flow channel 20 to distribute a marking fluid such as ink to the print
cavity 21 which holds a predetermined volume of ink between the resistive heater
elements 12 and the corresponding nozzle 19." Col. 3, ll. 1-13.
"An[ ] embodiment of resistive heater elements 12 is shown in FIG. 3 in which the
elongated portions 31 are curved and are joined by end portions 32 to form a small
elongated opening 30. Thin conductive strips 33 are formed at spaced intervals on
elongated portions 31. The conductive strips 33 extend radially on curved elongated
portions 31 to force the electrical current path to follow the curvature and avoid current
crowding problems." Col. 4, ll. 20-29. Furthermore, Figure 3 shows that the curved
elongated portions 31 and the end portions 32 collectively form an annular shaped
heating element 12, with an opening 30 in the middle.
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