Appeal No. 1997-3487 Page 2
Application No. 08/473,420
THE INVENTION
Appellant's invention relates to a composition containing a doped group III-V compound
having a low level of carbon and impurities. Claim 7 is illustrative:
7. A composition of matter for use as an optical window which:
(a) consists essentially of a compound taken from the class consisting of group III-V
compounds;
(b) has not more than about 1 part per million impurities; and
(c) has less than about 1 x 10 atoms/cc carbon;15
(d) said group III-V compound being doped with a dopant element taken from the class
consisting of shallow donors;
(e) said composition of matter for use as an optical window being transmissive to infrared
frequencies in the range of from about 1 micron to about 14 microns and being relatively opaque to
substantially all frequencies above about 14 microns and from about 1 micron to about x-ray
frequencies.
THE REFERENCES RELIED UPON
The prior art references of record relied upon by the examiner in rejecting the appealed claims
are:
McNeely et al. (McNeely) 3,533,967 Oct. 13, 1970
Bult et al. (Bult) 4,585,511 Apr. 29, 1986
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