Bacon & Thomas
Process for manufacturing road warning device for divided driveway
 The present invention pertains to a process for manufacturing a road warning device for a divided driveway, expecially a process for manufacturing a warning device in different colors, in order to match the traffic signs, in such a way that one first presses a melting pulp of potash-glass to form a main body, then high pressure spray a tinfoil metal powder on the spherical surface of the warning device, trim the circumferences of the uncooled reflecting spheroid, remove the excess metal alloy powder, and finally spray a metal-oxide or metal-halide (e.g. silver oxide, plumbous oxide or gold sodium chloride etc.) either on the entire spherical or semispherical surface of the reflecting spheroid, in order to show different colors on the reflecting spheroid. According to the preferred embodiment of the invention, the main body of the warning device is in white color and the reflecting spheroid exposed on the ground can be manufactured in different colors by means of spraying diverse metal compounds on it in order to match the traffic signs as well as to intensify its condensing and reflection effects by means of the metal powder sprayed on the external surfaces of the main body of the warning device. 
C E C
C03B E01F C03B
inventional inventional additional
Hung-Chun
Chen