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:
Jul. 04, 1978
Filed:
Jul. 10, 1970
Applicant:
Inventor:
Gerhard O Sauermann, Lexington, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
250199 ; 350 98 ;
Abstract
A transponder illuminated by broadband optical radiation which is reflected back towards the illuminator by means of corner reflectors. In front of the corner reflectors are placed a plurality of narrow band filters which define the communication channels. The return signal will consist of the activation of a number of discrete channels corresponding to the number of filters used. The system is not restricted to the visible spectrum permitting infrared and ultraviolet radiation to be used to provide a covert communication system.