Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2003-03-10
2009-02-03
Cain, Edward J (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S418000, C524S424000
Reexamination Certificate
active
07485676
ABSTRACT:
A non-birefringent optical resin material is composed of a resin material and inorganic fine particle material birefringence sign of which are the same. A molten resin material, which contains an inorganic fine particle material, dispersed therein, of the same birefringence sign as that of the resin. material, is caused to flow into a mold4through a gate5. The molten material flows as to expand radially. Velocity vector of the flow has normal components P, R in addition to straight-ahead component S. Bonding chains of the resin material are generally orientated to the direction of velocity vector. In the vicinity of points A, B on an equiphase face7, bonding chains of the resin material are generally orientated to lines extending from the exit of the gate5to point A and B, respectively. Flowing velocity has a gradient around each fine particle, causing the fine particle to be influenced by a moment and to tend to orientate so that the major axis of the particle is directed approximately parallel to equiphase faces6to9of the flow. On the whole material, this cancels birefringence.
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Cain Edward J
Staas & Halsey , LLP
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