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US Patent 4964711 - Viewing device
US Patent Issued on October 23, 1990
Estimated Patent Expiration Date:
February 9, 2009Estimated 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.
Estimated Patent Expiration Date:
February 9, 2009Estimated 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.AbstractThe present invention provides a viewing device, said device being positioned within the outer and inner surfaces of an entry door, to ascertain the identity of prospective entrants from within the confines of a dewlling. The device includes on the outer surface of the door a turret wherein at least four ports retain a like series of wide angles lenses. One of said ports and its lens is situated axially along a line from the eyepiece for straight ahead viewing, while the three ports and complimentary lenses are situated radially at right angles in relation to said axial port so as to give complete views of the area below and to the right and left of the doorway. A mirror, being positioned by a cam means, transmits the light and hence the image from each port to the user within the dwelling. By repositioning the mirror, the user may ascertain the presence and identity of visitors within a complete one hundred eighty degree field before the door. | InventorApplicationNo. 308794 filed on 02/09/1989US Classes:359/503, EXTENDED SPACING STRUCTURE FOR OPTICAL ELEMENTS49/171, Viewing, ventilating, or packet passage359/819Lens mountsField of Search49/171, Viewing, ventilating, or packet passage34/88, With display, inspecting, or illuminating means109/58.5Port typeExaminersPrimary: Arnold, Bruce Y.Assistant: Kachmarik, Ronald M. Attorney, Agent or FirmUS Patent References2638810, 3910676, 3973835, Security viewing deviceIssued on: 08/10/1976 Inventor: Miyakawa , et al.4050792, Observation port assembly Issued on: 09/27/1977 Inventor: Svensson4431276Specimen-holder system for upright microscopes Issued on: 02/14/1984 Inventor: Weber Foreign Patent References
International ClassesG02B 007/00G02B 009/10 E06B 007/28 |
