Uni-directional viewing system
Patent 3944336 Issued on March 16, 1976. Estimated Expiration Date: 
March 16, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 16, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1636834 2286570 2663218 2711667 2796801 2926559 InventorAssigneeApplicationNo. 487582 filed on 07/12/1974US Classes:359/485, Light polarization without any external input359/629By partial reflection at beam splitting or combining surfaceExaminersPrimary: Smith, Alfred E.Assistant: Henry, Jon W. Attorney, Agent or FirmAbstractA uni-directional viewing system with an obliquely disposed mirror defining a beam splitter for partial reflection and partial transmission of a light beam that is generated by a source and having an absorber disposed at one side of the mirror for absorbing the beam that is transmitted through the mirror. The reflected beam is directed towards a viewing port, which is disposed at the other side of the mirror. An eye port, which is disposed on the absorber side of the mirror, is provided for observing a subject at the viewing port. The observed subject views only the image of the source and the observer views the observed subject. | |
