Method of manufacture of identical parts displaying different in

Details Method of manufacture of identical parts displaying different in Method of manufacture of identical parts displaying different in

1981-10-15

1983-07-05

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

219121L, 219121LM, 264 51, 264132, 26432818, 4251744, B41M 526

Patent

active

043917640

ABSTRACT:
A method of manufacturing plastic parts which are otherwise identical but which display different indicia such as typewriter keys which comprises the steps of injection molding a plurality of identical parts of a plastic having a filler material capable of undergoing a color change and thereafter exposing individually the identical parts to a radiation source for changing the color of localized portions of the part to display the indicia while retaining the molded color of remaining portions wherein the plastic is polyacetal and the filler is carbon black or graphite.

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patent: 3266393 (1966-08-01), Chitayat
patent: 3443936 (1969-05-01), Menold
patent: 3506779 (1970-04-01), Brown et al.
patent: 3549733 (1970-12-01), Caddell
patent: 3651191 (1972-03-01), Glatt et al.
patent: 3657510 (1972-04-01), Rothrock
patent: 3678141 (1972-07-01), Metcalfe et al.
patent: 4013747 (1977-03-01), Hampel
patent: 4037075 (1977-07-01), Pugsley et al.
patent: 4064205 (1977-12-01), Landsman
patent: 4159414 (1979-06-01), Suh et al.
patent: 4277669 (1981-07-01), Alfano et al.
patent: 4307047 (1981-12-01), Edinger et al.

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