4 ms·

As I understand it the patent is only valid if it shows that the idea can be reduced to practice.

• Rochus 5y ago
  No. It must be novel, non-obvious and "useful", which obviously was considered to be fulfilled by the patent office. The patent describes how the invention can be used instead of tubes.
  • analog31 5y ago
    Doesn't there need to be a preferred embodiment? Not debating, just curious.
    • Rochus 5y ago
      I have not studied the content of the patent, but the "Cited by" list includes the Who's Who of the industry; so the invention is apparently relevant.
• pacificmint 5y ago
  Someone got a patent for a warp drive [1], so I don't think being actually possible is a requirement for patents. [1] https://patents.google.com/patent/WO2001057881A1/en https://patents.google.com/patent/WO2001057881A1/en