Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 5451886 | Method of evaluating lifetime of semiconductor material and apparatus for the same A method of and apparatus for evaluating the lifetime of a semiconductor material which is capable of measuring, in a non-contact and non-destructive manner, the lifetime of a surface thin-layer portion so as to evaluate the quality of a semiconductor dev... | 09/19/1995 |
| 5138255 | Method and apparatus for measuring lifetime of semiconductor material including waveguide tuning means A method and apparatus measure the lifetime of semiconductor materials having resistivity values within a predetermined measurement range. Carriers are produced within the semiconductor material responsive to incident energy. Microwave energy is radiated ... | 08/11/1992 |
| 5081414 | Method for measuring lifetime of semiconductor material and apparatus therefor A method and apparatus measure the lifetime of a semiconductor material by directing microwave energy into the semiconductor material and by producing carriers within the semiconductor material by impinging light thereon. A non-metal material is interpose... | 01/14/1992 |
| 5047713 | Method and apparatus for measuring a deep impurity level of a semiconductor crystal A semiconductor specimen is held by a stage which is equipped with a heater (and a cooler) to change the temperature of the specimen in a predetermined range. Minority carriers are generated in the specimen by irradiating it with an energy beam such as a ... | 09/10/1991 |
