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Guided answer
My patent lapsed. Can it be restored?
Two windows, and the arithmetic that decides which one you are in.
How long ago did the patent cease to have effect?
Count from the date of cessation, not from the date you noticed.
This is educational guidance, not personalised legal advice. It cannot see your documents, your dates or the prior art, and those are usually what decide the answer. Use it to understand the question, then take advice on your own facts.
Not sure whether this applies to your invention?
The honest answer usually needs someone to look at your actual disclosure, your timeline and the prior art. That is a conversation, not an article.