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2 Comments

Daniel PorterJan 25, 2013

Thanks for your question, Srividya. The earlier date is because of what's known as the one year "grace period." From 35 USC 102:

Daniel PorterJan 25, 2013

"(b) the invention was patented or described in a printed publication in this or a foreign country or in public use or on sale in this country, more than one year prior to the date of application for patent in the United States."