40`9 żO OPWA
FM
01 1
FIG. 2
16. The involved Snitzer application describes the
invention as follows:
It has been discovered that by passing light from
a source of the actuation frequency through a mask
with periodic variation in transmission, phase, or
other optical property a diffraction pattern is
formed that can be used to produce a periodic
variation in index along the core of an optical
waveguide fiber, and thus a Bragg grating.
(Snitzer 08/310,426 application, at 1).
17. Thus, the parties were on notice as to our finding of
the count term "phase grating mask."
18. None of the parties involved in this interference
objected to that finding.
Anderson's Brief on Priority
19. Anderson alleges a date of conception before 2 July
1992 (Paper 274 at 59).
6
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