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:
Jan. 06, 2004
Filed:
Oct. 03, 2001
Jerome T. Carollo, Carlsbad, CA (US);
Michael J. Hoppe, Vista, CA (US);
Rockwell Collins, Inc., Cedar Rapids, IA (US);
Abstract
Use of a filter in lieu of a secondary reflector in a reflective telescope provides compact design that eliminates the obstruction caused by the secondary reflector. The filter is selectively reflective to either the angle of incidence of radiation striking the filter or to the polarization exhibited by the radiation. An angularly sensitive filter may be constructed to either a bandpass filter or a short pass filter. A filter that is sensitive to polarization is constructed from a cholesteric liquid crystal. The filter is disposed in front of a primary reflector that comprises an aperture for collecting radiation observed by the telescope.