On this day in 1905 Marius Otto was granted the patent for Medical Ozonizer. U.S. Patent No. 790,655.

This patent relates to a process of ozonization for therapeutic purposes.

The medical ozonizer usually consists in principle of a small glass tube containing ozone, which is produced by Ruhmkorff coil, itself being operated by an ordinary vibrator or by a Wenhelt break; but reduced to these elements the ozonizer placed in the hands of patients presents a certain danger, because of the violence of the shocks of the Ruhmkorff coil.  To obviate this serious drawback the Medical Ozonizer was invented.

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