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:
Jun. 09, 1981
Filed:
Jun. 22, 1979
Charlie W Trussell, Jr, Woodbridge, VA (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
A device for responding to visible bright light and attenuating these bright lights over a spectral region wherein image intensifiers and the like are sensitive, including the near-infrared, to reduce glare and halation prior to entering the image intensifier and a method of manufacture of said device. The device is comprised of some electrochromic (EC) material sandwiched between two light transparent conductive means wherein one light transparent conductive means has a photoconductive coating in direct contact with the EC material. With a voltage source applying voltage across said two light transparent conductive means, this device remains transparent at low light levels, but when an incoming bright spot is focused on the device, the photoconductive coating conducts at the focal point and the EC material becomes dark at that point, thus absorbing the bright spot. When the bright spot is removed, the darkened area becomes transparent again.