Method to etch chrome deposited on calcium fluoride object

Details Method to etch chrome deposited on calcium fluoride object Method to etch chrome deposited on calcium fluoride object

2006-03-28

2006-03-28

Ahmed, Shamim (Department: 1765)

Etching a substrate: processes

Nongaseous phase etching of substrate

Etching inorganic substrate

C216S096000, C252S079100, C252S079500, C430S005000

Reexamination Certificate

active

07018556

ABSTRACT:
A method for maintaining a micro-roughness finish after etching chrome from a surface of a calcium fluoride (CaF2) object. Etching the chrome a first amount in a first chrome etchant. Etching the chrome a second amount beyond the first predetermined amount in second chrome etchant, such that the CaF2 object maintains a low micro-roughness.

REFERENCES:
patent: 5246801 (1993-09-01), Pierrat
patent: 6645856 (2003-11-01), Tanaka et al.
patent: 6825898 (2004-11-01), Kobayashi et al.
patent: 2004/0137336 (2004-07-01), Cummings

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