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:
Apr. 23, 2002
Filed:
Jan. 19, 1999
Roni Raviv, Nes Ziona 74061, IL;
Omri Rothschild, Tel Aviv 69937, IL;
Other;
Abstract
A device for use with a raster display having associated therewith electromagnetic noise which includes signals related to at least one raster synchronization signal. The device includes: an electromagnetic radiation pick up device operative to receive the electromagnetic noise in a wireless manner, a filter receiving an output from the electromagnetic radiation pick up device for producing a reconstructed raster synchronization signal from the electromagnetic noise; and a correlator correlating an information signal with the reconstructed raster synchronization signal. The device may be a light pen, and one version detects scan lines within a cone extending from the tip thereof. The number of scan lines detected within the cone can be used to estimate the distance of the light pen from a computer screen. A light pen method is also provided.