March 27, 1889Filed an application for a patent on improvements to a carpenters’ spirit-level.Read More | ||
March 31, 1891Issued US Patent No. 449,609 for improvements to the spirit level. He’d applied for this patent on August 5, 1890. | ||
April 14, 1891Issued US Patent No. 450,457 for improvements to the spirit level. He’d applied for this patent on August 4, 1890. | ||
August 17, 1891Signed an application for a patent for improvements to incandescent electric lamps in Queens, New York | ||
August 22, 1891Filed an application for a patent for improvements to incandescent electric lampsRead More | ||
August 26, 1891Signed an application for a patent for improvements to the conductors for incandescent lamps in New York | ||
September 2, 1891Applied for a patent for improvements to the conductors for incandescent lamps.Read More | ||
September 16, 1891Signed an application for a patent for improvements to incandescent lamps | ||
May 24, 1892Issued US Patent No. 475,394 for improvements to incandescent electric lamps | ||
July 19, 1892Issued US Patent No. 479,360 for improvements to the conductors for incandescent lamps | ||
October 14, 1892Signed an application for a patent for improvements in incandescent lamp caps. | ||
April 11, 1893Issued US Patent No. 495,467 for improvements to incandescent lamps. | ||
December 5, 1893Issued US Patent No. 510,018 for improvements in incandescent lamp caps. He’d applied for this patent on October 17, 1892. | ||
July 13, 1895Applied for a patent on improvements in an apparatus for canceling postal marksRead More | ||
October 1, 1895Issued US Patent No. 547,249 for improvements to incandescent lamps | ||
January 28, 1896Issued US Patent No. 553,673 for improvements in incandescent lamps. | ||
January 5, 1897Issued US Patent No. 574,414 for improvements in an apparatus for canceling postal marks. | ||
February 2, 1897Issued US Patent No. 576,266 for improvements in advertising devices | ||
January 11, 1898Issued US Patent No. 597,373 for the invention of an electric searing-pen | ||
July 12, 1898Received a patent for a public coin-operated x-ray vending machine | ||
May 17, 1910Issued US Patent No. 958,488 for improvements in x-ray tubes. | ||
September 5, 1911Issued US Patent No. 1,002,390 on improvements in x-ray tubes | ||
October 22, 1912Issued US Patent No. 1,042,109 on improvements in x-ray tubes | ||
July 29, 1913Issued US Patent No. 1,068,426 on improvements in vacuum-tubes |