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Let's first pardon my impertinence to answer my own question in an area where my knowledge is only cursory. The patent application of Snapchat was what might be construed as overly broad and most, if not all, of the functionality of WhatsApp's feature of ephemeral status updates infringe upon it. But the actually granted patent significantly narrowed ...


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Omitting the plastic bag would eliminate literal infringement of the claim but there is always the possibility of infringement under the doctrine of equivalents. However the claims already seem very broad even with the plastic bag. Thus, I would be surprised if such a claim would be found valid if challenged and even more surprised if found Infringed by a ...


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You should talk to an attorney. See Is It Possible to Notify Small Infringers With An Informal Letter and Avoiding Declaratory Judgment When Sending Licensing/Cease&Desist Letters You should discuss with your attorney if competitor's prior knowledge of your patent would lead to a willful infringement claim (see this article on a recent Supreme Court ...


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