Fixed shutter construction for a split-sphere observatory dome
Patent 4840458 Issued on June 20, 1989. Estimated Expiration Date: 
December 8, 2007. 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.
December 8, 2007. 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.InventorApplicationNo. 07/130125 filed on 12/08/1987US Classes:359/894, OPTICAL APERTURE OR TUBE, OR TRANSPARENT CLOSURE114/66, Observation boats359/227LIGHT CONTROL BY OPAQUE ELEMENT OR MEDIUM MOVABLE IN OR THROUGH LIGHT PATHExaminersPrimary: Bovernick, Rodney B.Assistant: Ben, Loha Attorney, Agent or FirmInternational ClassesG02B 23/16 (20060101)G02B 5/00 (20060101) AbstractA split-sphere observatory enclosure wherein the antrum segment is capped with a shutter lid. The rotor which is the active shutter segment sweeps through an elongate curved aperture in the shutter lid to reveal the oculus. The oculus may be completely covered by the shutter lid or completely exposed at any elevation between the horizontal and vertical or zenith positions. The weather resistance of the enclosure is enhanced through the provision of continuous seals between the segments.Other References
| |
