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:
Sep. 15, 1981
Filed:
Jul. 02, 1979
Hugh L Garvin, Malibu, CA (US);
Douglas A Pinnow, Pacific Palisades, CA (US);
Hughes Aircraft Company, Culver City, CA (US);
Abstract
A thin film polarizer for dividing electromagnetic energy into two mutually orthogonal components with a high degree of selectivity. A plurality of wire grids having an interelement spacing of less than one wavelength is supported by a substrate of electrically insulative material. The substrate is invisible to the wavelength of the polarized electromagnetic energy. The planar wire grids are substantially parallel and spaced less than one wavelength therebetween to achieve an efficient and compact thin film polarizer. The process of this invention for forming the plurality of wire grids comprises photolithographically defining each grid layer by the interference pattern of at least two coherent beams such as laser beams, one forming step being required for each grid, an anti-reflective layer being inserted between adjacent grid layers.