The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 1993
Filed:
Jan. 29, 1992
Gary J Thompson, Saugus, CA (US);
Arc Machines, Inc., Pacoima, CA (US);
Abstract
A configuration or system of lenses for use in an arc welding environment variably filters light so that the dramatic contrasts of light present in the welding area are reduced for better remote viewing. A photochromic lens forms a negative image of the welding area. The negative image of the photochromic lens serves as a variable density optical filter to reduce the brightness of the image incident upon the photochromic lens. A first lens initially gathers and focusses the light upon the photochromic lens. Subsequent lenses further prepare the image for camera reception by eliminating ultraviolet (UV) light, by eliminating light at spectral lines, and/or by enhancing the depth of field of the image.