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A sealed crustless sandwich for providing a convenient sandwich without an outer crust which can be stored for long periods of time without a central filling from leaking outwardly.
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| Number | Title | Issue Date |
| 5077487 | Driver circuit for a large capacity switching element A driver circuit for a large capacity switching element like power transistors etc. having an overdrive function. The driver circuit supplies a sharp overdrive current only at the build-up time and the control thereafter is effected by a constant current ... | 12/31/1991 |
| 5059887 | Step-up and step-down chopper device A direct current to direct current converting chopper device comprising essentially two switching elements, two reactors, two diodes and three condensers likewisely with a conventional device but able to maintain rather stable output voltages to avoid hig... | 10/22/1991 |
| 4984049 | Static induction thyristor A static induction thyristor having a mesh like gate region in front of the cathode, and between the gate region and the cathode a high resistance region having effective impurity concentration of 1011 cm-3 -5×1014 cm | 01/08/1991 |
