Air-heating furnace with automatically controlled air by-pass for preventing condensation

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

Why it's free to use

• Granted September 12, 1950. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by September 12, 1967.
• We check US rights only. Old patents can still inspire new ones: improvements may be patentable.