Scanning electron device
Patent 4020343 Issued on April 26, 1977. Estimated Expiration Date: 
April 26, 1994. 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.
April 26, 1994. 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 3795808 Video tracking system Patent #: 3953669 InventorsAssigneeApplicationNo. 05/678770 filed on 04/21/1976US Classes:250/310, Electron probe type348/162RESPONSIVE TO NONVISIBLE ENERGYExaminersPrimary: Smith, Alfred E.Assistant: Grigsby, T. N. Attorney, Agent or FirmInternational ClassH01J 37/28 (20060101)Foreign Application Priority Data1975-04-23 JAAbstractA scanning electron microscope or other type of scanning electron device incorporating a light pen for automatically changing the field of view of a specimen on a CRT. The output of said light pen controls the center and/or width of the scanning area of the incident electron beam irradiating the specimen when said light pen is directed towards a certain point in the initial specimen field of view on the CRT, thereby displaying said point at the center of the changed field of view on the CRT. | |
