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
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 >
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 >
Some accounts point to Charles Fredrick Wiesenthal of Germany, who received a patent in 1755 in England for a double-pointed mechanical needle device, as being the first to pioneer technology that would lead to the invention of the sewing machine. While not quite a machine, this was the first successful attempt at sewing performed by a mechanical device. The credit for an actual sewing machine is given to Thomas Saint, in the year 1790 in England.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 >