The Bureau of Labor Statistics reports that occupational therapists made $74,970 a year on average in May 2011. The top 10 percent of workers in the field made over $104,350 and the bottom 10 percent earned less than $49,980. Half of workers in the occupation made between $61,520 and $88,790 a year.
These patents covered a carbon rod in a nitrogen filled glass cylinder, and differed substantially from the first commercially practical bulb invented by Edison. Edison's major innovation was the first industrial research lab, which was built in Menlo Park, New Jersey. It was built with the funds from the sale of Edison's quadruplex telegraph.
The American inventor Thomas Edison held hundreds of patents, mostly for electrical devices and electric light and power. Although the phonograph and the electric light bulb are best known, perhaps his greatest invention was organized research.