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. 25, 1977
Filed:
Oct. 10, 1972
Hirokazu Negishi, Yokohama, JA;
Kazuya Matsumoto, Tokyo, JA;
Other;
Abstract
The outer surface of a transparent optical mass is directly coated with an internal reflection suppressing coating having an index of refraction smaller than that of the optical mass for suppressing internal reflections of light passing through the mass at angles of incidence to the surface greater than the critical angle. The coating includes a dispersing medium and a material in the form of light absorbing particles having dimensions smaller than one-fifth of the wavelength of visible light dispersed in the medium. The particles have a sufficient density near the surface to absorb a major portion of visible light at all wavelengths incident upon the surface through the mass at angles of incidence greater than the critical angle.