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How do you know if a patent has expired. I did a patent search and found a patent from 1991 that was very similar. how do I know if maintenance fees were kept up and it is still active?
Wiki User
∙ 13y ago
You need to contact and retain an actual patent attorney. Do not - at all costs - simply take the word on anyone here who might choose to venture an opinion.
Patent law is one of the most complex fields of laws, subject to near continuous change and interpretations. There are NO experts on line who you should listen to. Not even me - I'm just the one telling you not to listen, hire a real opinion instead.
Wiki User
∙ 13y ago
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When does the patent on methotrexate expire?
Supposedly it expired decades ago...
What is the most valuable patent in existence?
Lipitor which expired in 2011 was the most valuable patent ever with sales exceeding $105 over the life of the patent.
Why is generic divan not available if patent has expired?
sorry, I meant diovan
Do patents expire. What if something was patented in 1905 and they gave up. But the patent is still in the database?
Yes. Patents usually expire approximately over a period of 20 years or may expire soon if the annual maintenance fee is not paid properly. A patent published in 1905 is expired and will now be in public domain.
How long does a patent last from 1992?
US patents are for 20 years, so a 1992 patent expired on its issue date in 2012.
Does the expired first electric cigarette patent issued to me in 1965 have any value today?
The value of an expired patent depends on various factors such as the technology it covers, market demand, and potential for licensing or commercialization. While an expired patent no longer provides exclusive rights, it can still have historical or informational value. However, to determine its specific value in today's market, you may need to consult with a patent attorney or a professional in the relevant industry.
Who owns the patent to MDMA?
MDMA is not currently protected by a patent. The closest thing is Alexander Shulgin's 1959 patent on "4 alkyl dialkoxy N methyl phenethylamines and their pharamcologically acceptible salts," which has expired.
How long did Kane Kramer's patent last?
Patents last 20 years. Kramer's patent, US4667088, expired in 2007 but is still cited in new patents.
When does the patent on the drug pentasa expire?
I understand Shire bought up all generic manufacturers of Pentasa generic, since tha patent expired. Is that true?
How can you find out if a patent is still in effect?
A patent is active for its duration (generally counted as 20 years from its date of filing -- i.e., it's priority date), assuming all post-issuance fees have been paid. You can check with the patent office in the country where the patent was issued to determine its status in that country.
Who modified the saxophone?
Other companies that gained access to the saxophone technology after the patent expired improved the saxophone.
Does candy corn have a patent or copyright?
No; it was created in 1880, so any protection it might ever have had has expired.
