"Roeland M.J. Meyer" wrote:
> 
> I think I mis-read your original question. For some reason I read
> "unusable", sorry. Yes, the lapse of a patent means the technology
> becomes available for all to use, freely. This is my understanding.

 The idea behind patents is kind of contract:

 - The government grants a legal protection to the registrant,
   for a given time period,

 - In return, the registrant releases it's technology to public
   domain at the end of this time period.

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