DeepOrange and hirohiron,
"Regardless, you can build and use a patented product legally"
"Right, everyone can build not only heated chamber but also other patented stuff by themselves unless they sell it."
This is not at all true. If you read the
Manual of Patent Examining Procedure Title 35 U.S.C. 271 you will see:
"Except as otherwise provided in this title, whoever without authority makes, uses, offers to sell, or sells any patented invention, within the United States, or imports into the United States any patented invention during the term of the patent therefor, infringes the patent."
This means that you can infringe on a patent without selling anything.
In fact if you read
the Wikipedia article on Patent Infringement you will see:
"35 U.S.C. ? 271(b) covers situations where one actively induces the infringement of a patent by encouraging, aiding, or otherwise causing another person or entity to infringe a patent. A potential inducer must actually be aware of the patent and intend for their actions to result in a third party infringing that patent."
This means that if you know about a heated build chamber patent yet encourage others to infringe on said patent, you also could be held liable.
Cheers,
Jason