Gas injection gathers pace despite the patent disputes. (gas-assisted injection molding)

WITH the expiry of the original patent covering the injection of a gas into a moulding it might be expected that the muddy waters of gas assisted injection moulding might clear a little. But the public dispute between GAIN Technologies and Battenfeld since the expiry of the Friedrich patent has shown that little has actually changed.

For while the principle of injecting gas into a moulding is now in the public domain, the mechanics of doing so are still tied up in a web of patents and patent applications. The nature of patents being what it is -- a mechanism for proving