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From:
Top-Rated Orange County Patent Lawyer | Helping Inventors in Orange County, L...
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Offer for Sale - Inventor's own purchase order invalidates patent
https://ocpatentlawyer.com/offer-for-sale-inventors-own-purchase-order-invalidates-patent/
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A patent application must be filed within one year from the first offer for sale. A purchase order to your own manufacturer can trigger the offer for sale.
