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2. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a ... John Stenhouse filed two patents applying the absorbent properties of wood charcoal to air purification (patents 19 July ...

3. John Stenhouse - Wikipedia

   en.wikipedia.org/wiki/John_Stenhouse

   John Stenhouse's respirator. John Stenhouse was born in Barrhead in Glasgow on 21 October 1809. He was the eldest son of William Stenhouse, a calico-printer in the family firm of John Stenhouse & Co of 302 High Street, [2] Glasgow, and Elizabeth Currie; [3] he was the only one of their children to survive beyond infancy.

4. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   Woodcut of Stenhouse's mask. In 1848, the first US patent for an air-purifying respirator was granted to Lewis P. Haslett [5] for his 'Haslett's Lung Protector,' which filtered dust from the air using one-way clapper valves and a filter made of moistened wool or a similar porous substance. [6]

5. List of people who have headed the United States Patent Office

   en.wikipedia.org/wiki/List_of_people_who_have...

   Patent Office Head [1] Began service: Ended service: Commissioners for the Promotion of Useful Arts or Patent Board [2] Edmund Randolph Henry Knox Thomas Jefferson: 1790: 1793 Secretary of State [3] [2] Edmund Randolph: 1794: 1795 Timothy Pickering: 1795: May 12, 1800 John Marshall: May 13, 1800: March 4, 1801 James Madison: March 5, 1801: 1802 ...

6. Do Air Purifiers Actually Work? Here's What Experts Say - AOL

   www.aol.com/air-purifiers-actually-heres-experts...

   Air purifiers usually consist of a filter, or multiple filters, and a fan that sucks in and circulates air. As air moves through the filter, pollutants and particles are captured, and the clean ...

7. The air purifier you bought during the pandemic may still ...

   www.aol.com/air-purifier-bought-during-pandemic...

   Risks from the Covid-19 pandemic and increasingly intense wildfire seasons sparked interest in air purifiers as a tool to keep indoor air healthy. But experts say they can be just as important to ...

8. John D. Craig (Superintendent of Patents) - Wikipedia

   en.wikipedia.org/wiki/John_D._Craig...

   John D. Craig (1766 – January 25, 1846) was third Superintendent of Patents of the United States, serving from June 11, 1829, to February 1, 1835. [1]Born in Ireland, he taught at the Baltimore Union School, and in 1828 led the founding of the Ohio Mechanics Institute of Cincinnati, which became the College of Engineering and Applied Science of the University of Cincinnati.

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