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In theory, a royalty is a term of contract under which someone pays for the use of rights under property owned by others, often as a percentage of profits.
In practice, requiring someone to pay royalties for an invention after it becomes "public domain" would be considered a "misuse of patents", by attempting to extend its term against contracted parties.
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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
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?
Yes, but only for "bragging rights". Any patent issued in 1965 expired long ago, making the inventions claimed in it "public domain". Old patent are sometimes "valuable" as "prior art" to prevent others from attempting to patent the same thing AGAIN.
Is royalty paid for mining attract TDS?
yes
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.
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.
