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...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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US Patent 4978891 - Electrodeless lamp system with controllable spectral output
US Patent Issued on December 18, 1990
Estimated Patent Expiration Date:
April 17, 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:
April 17, 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.AbstractAn electrodeless lamp system and method for providing light output having a controlled spectral distribution. A lamp having a fill which is not fully vaporized at the lamp operating temperature and which emits in a characteristic region of the spectrum is used. A function generator generates a function signal, and the magnitude of the lamp output in the characteristic region or the ratio of such magnitude and a magnitude in a different characteristic region is compared with the function signal. The difference signal is used to control the amount of cooling gas which is incident on the lamp bulb to control the spectral distribution of the radiation which is emitted by the lamp. | InventorAssigneeApplicationNo. 344863 filed on 04/17/1989US Classes:315/117, Automatic control of the temperature modifier315/151, Load device irradiating the radiant energy responsive device315/248, Induction-type discharge device load315/326, DISCHARGE DEVICE LOAD315/344Electromagnetic influenced discharge deviceField of Search315/248, Induction-type discharge device load315/117, Automatic control of the temperature modifier315/118, Load device circuit controlled by the temperature modifying medium315/326, DISCHARGE DEVICE LOAD315/344, Electromagnetic influenced discharge device315/112, WITH LOAD DEVICE TEMPERATURE MODIFIER315/151, Load device irradiating the radiant energy responsive device313/13Having control means for the temperature modifierExaminersPrimary: LaRoche, Eugene R.Assistant: Neyzari, Ali Attorney, Agent or FirmUS Patent References3604500, 3786308, 4256404, Optoelectronic feedback control for a spectrometerIssued on: 03/17/1981 Inventor: Walker4431947, Controlled light source Issued on: 02/14/1984 Inventor: Ferriss , et al.4449821, Process colorimeter Issued on: 05/22/1984 Inventor: Lee4485332, Method & apparatus for cooling electrodeless lamps Issued on: 11/27/1984 Inventor: Ury , et al.4695757Method and apparatus for cooling electrodeless lamps Issued on: 09/22/1987 Inventor: Ury , et al. International ClassesH05B 041/24H01J 015/04 |
