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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 ...
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]
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.
One of tallest (nearly 24 inches) and heaviest (17.5 pounds) air purifiers tested, the Winix 5500-2 Air Purifier is ideal for small-to-medium rooms (up to 360 square feet), with a True HEPA filter ...
The Invention Secrecy Act of 1951 (Pub. L. 82–256, 66 Stat. 3, enacted February 1, 1952, codified at 35 U.S.C. ch. 17) is a body of United States federal law designed to prevent disclosure of new inventions and technologies that, in the opinion of selected federal agencies, present an alleged threat to the economic stability or national security of the United States.
An example of a homemade unit. The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four [1] or five [2] [3] HVAC particulate air filters that form a cube and a box fan to draw air through the filters.
The Court found contributory infringement for the sale of the defendant's ink with patent owners machine. Westinghouse Electric and Manufacturing Company v. Wagner Electric and Manufacturing Company. - Supreme Court, 1912. Bauer & Cie. v. O'Donnell - Supreme Court, 1913. Patent licensing terms do not include dictating the price of the product ...
Smog towers or smog free towers (see below for other names) are structures designed as large-scale air purifiers to reduce air pollution particles . This approach to the problem of urban air pollution involves air filtration and removal of suspended mechanical particulates such as soot and requires energy or power.