In December of 1884, George B. Snow of Buffalo, New York, filed a patent application for his “inhaler” with its “capillary feeder leading from the [chloroform] reservoir below to the [nitrous oxide] inhaling-tube above”— from B to A in two of the filed diagrams (left). Snow’s filing was granted U.S. Patent No. 312771 in February of 1885, and he assigned patent rights to the Buffalo Dental Manufacturing Company. Within two months that company was advertising Snow’s innovation in the Dental Advertiser as a “Chloroform Mixer for Attachment to Nitrous Oxide Apparatus” (right). (Copyright © the American Society of Anesthesiologists, Inc.)
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Anesthesiology Reflections from the Wood Library-Museum| February 2013
G.B. Snow’s Inhaler or Chloroform Mixer
George S. Bause, M.D., M.P.H.
Anesthesiology February 2013, Vol. 118, 250.
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George S. Bause; G.B. Snow’s Inhaler or Chloroform Mixer. Anesthesiology 2013; 118:250 doi: https://doi.org/10.1097/ALN.0b013e3182867a20
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Practice Guidelines for Moderate Procedural Sedation and Analgesia 2018: A Report by the American Society of Anesthesiologists Task Force on Moderate Procedural Sedation and Analgesia, the American Association of Oral and Maxillofacial Surgeons, American College of Radiology, American Dental Association, American Society of Dentist Anesthesiologists, and Society of Interventional Radiology