Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8104094 | Clean, cool, comfortable welding helmet This invention defines a welding helmet that encloses a welders head on five sides and with an optional skirt covers their neck. The helmet contains a fan, filter and cooling module to provide clean cool air that reduces welding fume levels in the breathing zone bel... | 01/31/2012 |
| 7971267 | Air supplying device for welding mask Disclosed is an air supplying device for a welding mask, capable of supplying clean air into a face shield of the welding mask. According to an embodiment of the present invention, more specifically, the air supplying device comprises a housing connected to the face... | 07/05/2011 |
| 7178932 | Welding helmet Apparatus 10 discloses an improved welders helmet having a replaceable lens 16 thereon incorporating an electrically driven fan 14 which receives filtered air through a plurality of air ducts 24 having a filter 22 thereon. A recept... | 02/20/2007 |
| 7178528 | Headgear for noninvasive ventilation interface The present invention is a headgear for noninvasive ventilation interface made up of a nasal cannula including cannula tubing having a given outside diameter, and a headgear yoke with ends including tubing retainers. The yoke is adapted to extend transversely over a... | 02/20/2007 |
| 4309774 | Ventilating helmet A ventilating helmet which takes the form of sheet material wall member which has mounted thereon an electrically operated fan which is adapted to move air to the interior of the helmet. The electrically operated fan is to be operated through the use of a... | 01/12/1982 |
| 4293757 | Automatic welder's helmet having ventilation means Improved automatic welder's helmet having pneumatic control to effect closing of the helmet's dark eye shield prior to energizing the electrode for striking the welding arc, and further to maintain the dark eye shield closed until after the arc and weldme... | 10/06/1981 |
| 4207882 | Filter apparatus for welding mask A filter apparatus for a welding mask having airways passage forming structure including a pair of filtered remote inlets and including an intermediate mouthpiece whereby filtered ambient air may be supplied to the mouthpiece. An exhaust structure is comm... | 06/17/1980 |
| 4195363 | Perimeter draft welding hood A mask or hood worn by a welding or grinder operator includes a manifold extending along the lower perimeter thereof below the chin of the operator. The manifold is provided with a plurality of holes or slots which vent pressurized air downwardly. The dow... | 04/01/1980 |
| 4172294 | Protective all-purpose helmet A protective helmet of the type which substantially completely surrounds the wearer's head to provide maximum protection from otherwise hazardous conditions encountered during sand blasting, steam or high pressure water jet cleaning, welding, and other op... | 10/30/1979 |
| 4080664 | Welder's hood with air filter A protective welder's hood including changeable air filter structure to protect the health of a welder wearing same. The hood includes an airtight face-engaging mask together with a flutter or flapper valve to permit exhaust of expelled breathing air.... | 03/28/1978 |
| 3943573 | Automatic protective shade equipment on protective visors, protective helmets or protective goggles, particularly for fusion welding Automatically operable protective means, e.g. a helmet, for use by welders, has an eye shading means which is brought automatically into shading condition upon reception of light rays or ultrasonic vibrations by a transducer and electromagnetic operator. ... | 03/16/1976 |
