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Grain Harvester
(U.S. Patent and Trademark Office, 1994-06-28)
A grain harvester for propulsion by a tractor over a field of grain growing on upwardly extending plant stems, the harvester having a housing supported and movable in a direction of travel over a field of grain by a tractor, ...
Polarization Independent Low Cross-talk Optical Circulator
(U.S. Patent and Trademark Office, 1994-06-07)
There is provided an optical circulator (16) for bidirectional communication on a fiber optic communication transmission system. A reflection rhomb (17) includes a polarizing thin film (26) and an inclined, internally ...