The patent for Viagra in in the United States is owned by the company Pfizer. Pfizer is a pharmaceutical business that has continuously and exclusively maintained the patent for the Viagra brand name and the drug Sildenafil.
I don't know. But the way to find out is www.USPTO.gov. The US Patent and Trademark Office. They allow searches by many criteria. It will take just a little work, but once you know how to search on USPTO, your power will increase.
Dupont
The patent was issued to Maurice A. McLean and Stephon D. Brown.
Start with the formula: C22H30N6O4S, and go from there. You better ask the company that owns it first though!
Since Dupont invented it, one would suppose Dupont once owned the patent for it. However, it would have expired or lapsed many years ago because they started using it in the early 1930s. So, in other words, there is no patent for R-11.
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.
In the US, Viagra is a patent-protected prescription-only drug, meaning you need a prescription and will shell out a considerable amount per pill. Finding it on-line is very hard, mainly because of scams. Be very careful! My boyfriend managed to find a non-US online pharmacy selling the generic form of Viagra for a tenth of the cost, and got it shipped in the US with no problems. It's identical to the original, produced in pharmaceutical laboratories and all that, but it does not have marketing costs attached. Good stuff can be found if you know where to look.
had to have been the inventor George Beauchamp in 1931 as he owns the patent for electric Guitars and single coil pickups.
Depends on the type. Having all wheels driven can't be patented, but you can patent various ways of transferring the power.
To properly reference a patent in your research paper, include the patent number, title, inventor(s), assignee (company or individual who owns the patent), publication date, and the URL or database where the patent can be accessed. Use the appropriate citation style recommended by your academic institution or publisher.
Viagra is made by the Pfizer corporation. The patent expired in 2013 and now many companies are working to develop cheaper generic clones.
Technically, a patent is granted to the inventors, but in practice, the corporation that employs the inventors owns the invention, the application and the resulting patents, if any, through an "assignment of rights" filed in the USPTO.