Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!

Day in Engineering History Archive - July 31

Day in Engineering History July 31 Archive - RF CafeJuly 31

Samuel Hopkins Awarded 1st U.S. Patent - Please click here to visit RF Cafe.1790: The first U.S. patent was issued to Samuel Hopkins for his process for making potash and pearl ashes. 1792: The foundation stone of the U.S. Mint in Philadelphia was laid. 1918: Francis Stanley (not his twin brother Freelan), famous for their Stanley Steamer automobile, died. 1923: Stephanie Kwolek, inventor of Kevlar, was born. 1937: Charles Hires of root beer fame died. 1965: The last cigarette commercial appeared on British television. 1964: Space probe Ranger 7 transmitted the first close-up images of the moon's surface ever taken by a U.S. spacecraft. 1969: A Moscow police chief reported that thousands of Moscow telephone booths had been made inoperable by thieves who had stolen phone parts in order to convert their acoustic guitars to electric. 1971: Astronauts rode in a vehicle on the moon for the first time in a lunar rover vehicle (LRV). 1998: IBM's Russian subsidiary agreed to pay $8.5 million in fines for selling powerful computers ultimately destined for a Russian nuclear weapons laboratory. 2003: Felix Baumgartner was the first to cross the English Channel by unpowered flight when he jumped from 30,000-ft and glided 22 miles wearing a birdman suit.

| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |

Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in this article, there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative sources. On RF Cafe, events with hyperlinks have been verified. Many years ago, I began commemorating the birthdays of notable people and events with special RF Cafe logos. Where available, I like to use images from postage stamps from the country where the person or event occurred. Images used in the logos are often from open source websites like Wikipedia, and are specifically credited with a hyperlink back to the source where possible. Fair Use laws permit small samples of copyrighted content.

RIGOL Technologies (test equipment) - RF Cafe
Triad RF Systems Amplifiers - RF Cafe
Axiom Test Equipment - RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
RF Electronics Shapes, Stencils for Office, Visio by RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com