Vandal-resistant security view port
Patent 4571901 Issued on February 25, 1986. Estimated Expiration Date: 
March 16, 2004. 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, 2004. 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 1747156 2771971 3173180 3203052 InventorsApplicationNo. 06/590565 filed on 03/16/1984US Classes:52/106, JAIL-TYPE STRUCTURE49/171, Viewing, ventilating, or packet passage52/209Having a drain or ventExaminersPrimary: Friedman, Carl D.Assistant: Smith, Creighton Attorney, Agent or FirmInternational ClassesE04H 3/08 (20060101)E06B 7/00 (20060101) E06B 7/30 (20060101) AbstractA vandal-resistant security view port for use in prison cells and the like. The view port permits observation into a cell or room and is mounted on a frame which can be attached over an opening in a wall of the cell. The view port has a transparent pane and a grate and may be open or covered by a hinged door operable from the back side of the wall.Field of SearchRetaining feature between frame and reveal | |
