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| Number | Title | Issue Date |
| 6614409 | Glare shielding device of welding helmet and method of controlling the same The present invention discloses a glare shielding device. The glare shielding device includes a microprocessor for controlling an activation time and a driving time of a liquid crystal panel. The microprocessor generates an activation control signal of a ... | 09/02/2003 |
| 4707860 | Welding shield Welding shield adapted to be positioned in front of the face of the welder for protection radiation. Said shield comprises a transparent dark welding glass (17) which is arranged as a locally limited portion to be positioned in front of the eyes. Around t... | 11/24/1987 |
| 4373212 | Light blocking lens for welder helmet In the sight opening of the face shield of a welding helmet, a protective lens overlying a filter lens and having a light impervious coating about its edge portion blocking the passage of light rays through its edge portion and through the clearance about... | 02/15/1983 |
| 4354279 | Welding mask corona barrier A corona barrier insert for a welding mask having a shield section and a main frame defining a viewing port in the shield section and a lens assembly including an outer pane made of glass and an inner pane of tinted glass to block out harmful rays. The co... | 10/19/1982 |
| 4155122 | Light shield for welder's mask A welder's helmet has a window with an upper section of invariable light-attenuation characteristics and a dimmable lower section comprising an ultraviolet filter, an infrared filter, and an electro-optical shutter such as a liquid crystal sandwiched betw... | 05/22/1979 |
