When using text from articles published in journals and magazine, we need to obtain copyright permission from the copyright owner (publisher or author). I wonder if we need copyright permission when using text from a US Patent addressing that patent?
The reason that I'm asking is that patent text are freely available on the internet, contrary to journals. In addition to the official website of the US Patent, there are many websites which freely distribute patents.
Have these websites obtained copyright permission fro the US Patent and Trademark Office?