inventor Dr. Prohaska to corroborate a date of conception by the
end of July 1992 (Paper 278 at 40).
99. Snitzer argues that the Invention Questionnaire,
entitled "Mask Fabrication of Photo Refractive Gratings"
describes every element of the count with the exception of a
"phase grating mask" (Paper 278 at 41).
100. The Questionnaire refers only to a periodic object
mask (Snitzer Ex. 3032).
101. Illustrations and examples of the "periodic object
mask" are illustrated as an amplitude mask only (Paper 278 at
44).
102. In July 1992, the Snitzer inventors contacted
Dr. Rishton about obtaining a grating mask that the inventors
could use in experiments for forming Bragg gratings.
103. In his declaration, Dr. Rishton stated that on 22 July
1992, he spoke with Dr. Snitzer about obtaining a grating mask
(SR 470, 1 8).
104. Rishton recalls Dr. Snitzer mentioning, during the 22
July 1992 conversation, both amplitude and phase masks and that
Snitzer and Rishton discussed the possibilities of fabricating
both (SR 470-471, 1 9).
105. Rishton recalls a conversation he had with Dr.
Prohaska within a few days of speaking with Dr. Snitzer, in which
the two discussed the type of mask to be fabricated.
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