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:
May. 18, 1993
Filed:
Jun. 18, 1991
Gary A Ball, Newington, CT (US);
Richard A Meinzer, Glastonbury, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A detector for laser radiation that detects the presence of above-threshold radiation in one of a set of wavelength ranges employs a set of Fresnel lenses designed to focus radiation in a particular band onto a metal-coated film. A series of Fresnel lenses is designed with constant focal lengths, but each lens is designed to have that focal length at a specific wavelength. Only when the wavelength of the incident radiation matches the design wavelength of the Fresnel lens will the film be marked or machined. Radiation of differing wavelengths will be defocused to a degree that will reduce the intensity below the level that will mark or machine the film. An electronic based version of this spectroscopy detector can also be implemented.