Coating implements with material supply – Solid material for rubbing contact or support therefor – Including holder
Patent
1993-03-03
1993-09-14
Bratlie, Steven A.
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including holder
B43K 1914, B43K 1918
Patent
active
052442977
ABSTRACT:
According to the invention, the writing or coloring pencil is obtained by tri-extrusion of three thermoplastic materials forming the lead material, the expanded wood material and an intermediate protective layer, containing no expanding agent, which is compatible with the lead material and the wood material and has a melting point which is equal to or higher than the melting points of the lead material and the wood material. The three co-extruded materials all contain in particular the same basic component, such as for example a polystyrene-methacrylate copolymer. The protective layer can be of a different color from the other two layers. The writing or coloring pencil with protective casing between the lead and the expanded wood, all three being in thermoplastic material, is, in particular a pencil with soft or extra-soft lead.
REFERENCES:
patent: 2790202 (1957-04-01), Lorenian
patent: 3625788 (1971-07-01), Bartner
patent: 3704071 (1972-11-01), Muller et al.
patent: 4176978 (1979-12-01), Ruzicka et al.
Bachelet Jacques
Chavatte Philippe
Chochoy Guy
Duez Jose
Fouble Claude
Bratlie Steven A.
Conte S.A.
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