Vacuum Tube Invented
November 16, 1904
John Ambrose Fleming applies for a US patent on what he called the “oscillation valve“, the first example of the vacuum tube. Vacuum tubes would form the basis of electronic technology for nearly 50 years until the development of the transistor. Fleming’s invention has been described as one of the most important developments in the history of electronics.
The Dawn of the Microprocessor
November 15, 1971
An advertisement in the magazine Electronic News announces the Intel 4004, the first commercially available microprocessor. The 4004 was primarily used in calculators, the first being the Busicom 141-PF. In fact, it was Busicom that actually developed the design of what would become the Intel 4004. Busicom approached Intel to help them finalize the design and manufacture their “calculator engine”. Intel’s engineers reduced the 12 integrated circuit design Busicom had come up with to 4 ICs and delivered the finished product in January 1971. Busicom had exclusive rights to that design until later in that year, when Busicom and Intel renegotiated their contract with Intel lowering their prices to Busicom in exchange for rights to the design of the microprocessor.
By offering the first general-purpose programmable processor to the general market, Intel spurred the rapid development of electronic devices in the 1970s, culminating in the development of personal computers during that decade. However, Intel wasn’t the clear leader in the microprocessor market until the IBM PC and clones helped catapult Intel to that title in the 1980’s.
Apple Passes $500 Billion Valuation
February 29, 2012
The stock value of Apple, Inc. surpasses $500 billion, setting a new record for the company which was already the world’s most valuable company at the time. This day marks a milestone on the historic run for the company from near-bankruptcy in the 1990’s to one of the most, if not the most, dominant technology company in recent history. Apple would later become the first company in history to surpass $700 billion in value in February 2015.
Tokyo Skytree Completed
February 29, 2012
Construction of the Tokyo Skytree broadcast tower, delayed two months due to the 2011 Japan earthquake and tsunami, is completed on leap day – February 29th, 2012. The Tokyo Skytree is the tallest structure in Japan and the world’s tallest tower.