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Subject: Re: Spray etcher

From: "Phil" <phil1960us@...>
Date: 2004-07-21

--- In Homebrew_PCBs@yahoogroups.com, Markus Zingg <m.zingg@n...>
wrote:
>
> Bungard, but since it dates back to the sixties I figure the patent
> protection is meanwhile void. I'm however not experienced, that
said I
> don't know if a patent is protecting "forever" or if it's only
> effective for some years.
>

17 years