Celanese v. ITC: How the On-Sale Bar Can Turn Sweet Sales into Spoiled Patents
Briefly

The Administrative Law Judge determined that previous sales using a secret process invoked the on-sale bar, concluding that the America Invents Act did not alter existing legal standards.
Celanese claimed that under the America Invents Act, their previous undisclosed sales of Ace-K should not trigger the on-sale bar, but this argument was dismissed based on legal precedents.
Read at Intellectual Property Law Blog
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