The doorknob was invented in 1878 by Osbourn Dorsey when he filed a patent for an internal mechanism that latched doors shut. If Dorsey's knob was on the left side of a door, it unlatched a metal bar on the right side of the door.Know More
The metal rod latched into a hole in the door frame. Homeowners accessed the connection in the frame by unscrewing a small metal cover.
Before doorknobs, homeowners secured doors by using a latch string that looped around a bar to keep strangers out. In ancient times, people raised and lowered bars to secure doors so that people could not get inside.Learn more about Inventions
Otis Boykin invented the resistor, and he received a patent for it on June 16, 1959. Boykin was an electronic scientist and inventor who lived from 1920 to 1982. He held a total of 26 patents when he died, having invented other significant devices, such as a control unit for pacemaker machines.Full Answer >
Mary Phelps Jacob, a New York socialite, received a patent for the "Backless Brassiere", the precursor to the modern bra, on Nov. 3, 1914. She created it using two handkerchiefs and a ribbon after buying a sheer evening dress that was unsuitable for wearing with a whalebone corset.Full Answer >
Richard Arkwright and John Kay of Great Britain invented the water frame in the late 1760s, and Arkwright applied for a patent in 1769. The patented spinning machine twisted 96 strands of yarn simultaneously.Full Answer >
The earliest working telescope design is attributed to Dutch eyeglass maker Hans Lippershey, who applied for a patent to his design in 1608. Two other Dutch eyeglass-making contemporaries of Lippershey, Zacharias Janssen and Jacob Metius, had developed similar telescope designs in the same year.Full Answer >