1814
Joseph Nicéphore Niépce achieves first photographic image with camera obscura - however, the image required eight hours of light exposure and later faded.
1837
Daguerre’s first daguerreotype - the first image that was fixed and did not fade and needed under thirty minutes of light exposure.
1840
First American patent issued in photography to Alexander Wolcott for his camera.
1841
William Henry Talbot patents the Calotype process - the first negative-positive process making possible the first multiple copies.
1843
First advertisement with a photograph made in Philadelphia.
1851
Frederick Scott Archer invented the Collodion process - images required only two or three seconds of light exposure.
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