Date: Thu, 15 Apr 1999 09:41:08 -0700
From: Ed Suominen <ed-AT-eepatents.com>
Subject: Pioneering EE Patents: The Transistor


Pioneering EE Patent, featured Apr. 15-30
"Three-Electrode Circuit Element Utilizing Semiconductive Materials"
Issued 1950 to Bell Labs for the point-contact transistor.
Get a free copy of this historic patent (or just view a summary)
at http://eepatents.com/feature

U.S. Patent 2,524,035 describes one of the most significant
inventions of all time as follows:

  ...a block of semiconductor material on which three electrodes
  are placed. One of these, termed the collector, makes rectifier
  contact with the body of the block. The other, termed the
  emitter, preferably makes rectifier contact with the body of
  the block also. The third electrode, which may be designated
  the base electrode, preferably makes a low resistance contact
  with the body of the block.

Upcoming features will include the original patents for the
Costas loop and the negative feedback amplifier. For the
first half of April, the featured patent was "Method of
Receiving High Frequency Oscillations," issued 1920, for
the superheterodyne receiver. It's archived at
http://eepatents.com/feature?m04d01

Ed Suominen
Registered Patent Agent
Former R&D Engineer, RF/DSP
Web Site: http://eepatents.com


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