Light Bulb Patent Print
This Patent for a Tungsten And Method Of Making The Same For Use As Filaments Of Incandescent Electric Lamps And For Other Purposes was invented by William D. Coolidge and filed on June 19, 1912. It was issued on December 30, 1913 by the United States Patent and Trademark Office.
Please Choose your Options for your Patent Print:
Discounts: Buy more - save more
Buy 3 or more items, get 5% off
Buy 5 or more items, get 8% off
Buy 7 or more items, get 10% off
Buy 10 or more items, get 15% off