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:
Feb. 20, 1990
Filed:
May. 18, 1988
George C D'Ambrosia, Penfield, NY (US);
Christopher A Ludden, Fairport, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An intrusion detection device which comprises a radiation emitter arranged to project a beam of infrared radiation toward a field of view and means for receiving the radiation of the beam reflected from the field of view. The receiving means is arranged to generated a signal indicative of the distance from the device at which the beam has between reflected by the field of view during a selected time period. Means is also provided for storing a reference signal which is indicative of the distance of reflection of the beam from the field of view during a reference time period. Further means is provided for comparing a signal from a selected time period with the reference signal and for generating an output signal if the signal differs from the reference signal in a preselected manner.