On 7/9/16 12:09 PM, David Gilbert wrote:
It doesn't even have to be the fault of the receiving entity, whether
that be a new location or new owners. I worked in the semiconductor
industry for over 30 years and saw several examples of "lost recipes"
simply because the original process was never properly investigated,
characterized, and documented in the first place. Processes that had
produced excellent product for years might suddenly shift because some
influence that had never been understood at all changed.
We actually had one product that shifted dramatically for the worse
because a piece of equipment was upgraded to a cleaner version, and it
took a lot of engineering work to understand the favorable impact that
the carrier lifetime killing effect from the older, dirtier equipment
had on the product.
You hear a lot of stories about trace contaminants making electron gun
cathodes "work" or not. Someone gives up smoking, and all of a sudden,
things don't work the same as they used to.
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