Early History
From 1838 to 1861, inventors could file patent applications on improvements to their inventions. These were published as "additional improvement patents" and were given numbers preceded by "A.I.". About 300 of these patents were issued.
Read more about this topic: Continuing Patent Application
Famous quotes containing the words early and/or history:
“With boys you always know where you stand. Right in the path of a hurricane. It’s all there. The fruit flies hovering over their waste can, the hamster trying to escape to cleaner air, the bedrooms decorated in Early Bus Station Restroom.”
—Erma Bombeck (20th century)
“It is remarkable how closely the history of the apple tree is connected with that of man.”
—Henry David Thoreau (1817–1862)