CNET

Apple's a very secretive company and requires its suppliers to act the same way. So, it was an unexpected turn when GT Advanced -- which produced synthetic sapphire for Apple -- spent about two-dozen pages bemoaning the tech giant.

In court papers made public Friday, GT -- a New Hampshire-based firm that filed for bankruptcy last month -- provided a rare and unflattering view of what it was like for it to be an Apple supplier and what went wrong in its relationship with Apple.

GT Advanced late last year signed a $578 million deal to develop sapphire exclusively for Apple in a 1.4-million-square-foot facility in Mesa, Ariz. The final $139 million installment was expected by the end of last month. GT instead filed for bankruptcy protection, and Apple and GT have since reached a settlement deal.

Here are a few insights from Friday's bankruptcy papers: