Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Reexamination Certificate
2005-05-17
2005-05-17
Gabor, Otilia (Department: 2878)
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
C250S474100
Reexamination Certificate
active
06894284
ABSTRACT:
This invention provides a method of detecting sub-ppm lead impurity levels in a below 200 nm transmitting optical calcium flouride crystal. The method includes providing a below 200 nm wavelength transmitting optical flouride crystal having a crystal light transmission path length, providing a 200-210 nm spectrophotometer having a light source for producing a transmission test wavelength in the range 200 to 210 nm and a transmission detector for measuring transmission of the test wavelength, and transmitting the transmission test wavelength in the range of 200 to 210 nm through the below 200 nm wavelength transmitting optical flouride light transmission path length and measuring the transmission of the 200 to 210 nm test wavelength through the path length to provide a lead ppb impurity level measurement less than 500 ppb. The invention provides for improved manufacturing of below 200 nm wavelength optical elements and optical fluoride crystals such as ultralow lead contaminated calcium flouride.
REFERENCES:
patent: 6226128 (2001-05-01), Shiozawa
patent: 6377332 (2002-04-01), Sakuma
patent: 6395657 (2002-05-01), Mayolet et al.
patent: 6630117 (2003-10-01), Sparrow
patent: 20010046091 (2001-11-01), Mayolet et al.
patent: 20020132719 (2002-09-01), Mayolet et al.
patent: 20040026631 (2004-02-01), Mayolet et al.
patent: 20040115485 (2004-06-01), Mayolet et al.
patent: WO0186032 (2001-11-01), None
Mayolet Alexandre M.
Pell Michael A.
Timofeev Nikolay T.
Corning Incorporated
Douglas Walter M.
Gabor Otilia
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