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.
Honeywell owns the patent on R-410A refrigerant.
There is no patent on R-134a, only on methods of producing and using it.
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.
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.
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.
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.
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.
R134a is a refrigerant gas
There are literally hundreds of patents for carburetors all over the world, and you would need to look in the patent files of the country of interest, and in the specific category and subcategory related to the particular invention that applied to the carburetor.
Can you mix r134a with r410a?
I just looked this up and saw an article that claims it isnt, it says that despite their marketing that says crislite ia patented, a recent financial report from crocs says it isnβt.