High pressure sodium discharge reflector lamp
Patent 4939408 Issued on July 3, 1990. Estimated Expiration Date: 
June 29, 2008. 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.
June 29, 2008. 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 ReferencesMetal vapor discharge lamp Discharge lamp with neon gas in outer tube Lamp with light-source capsule support members having equal thermal conductivity Patent #: 4758759 InventorApplicationNo. 212811 filed on 06/29/1988US Classes:313/25, Sealed casing for envelope313/113, Reflector313/573, Having specified envelope detail313/634, Envelope with particular structure313/642And rare gasExaminersPrimary: Wieder, Kenneth A.Attorney, Agent or FirmForeign Patent References
International ClassH01J 061/34AbstractA high pressure sodium discharge reflector lamp having a blown glass outer envelope. The outer envelope contains a rare gas having a fill pressure slightly less than one atmosphere and a pressure at lamp operating temperature of approximately one atmosphere for implosion protection. | |
