NyQuil doesn't have a patent on its own; instead, Procter & Gamble is party to a large number of patents for things like "antitussive pharmaceutical compositions for the peroral administration of dextromethorphan."
The US patent number is US 7198789 B2.
There is no US patent 555408021. There is also no US patent 55408021.
The number is 3359678
US Patent No. 1582
You will have to check with the US Patent Office
It is US47114711UHP
That is the patent number for the first basketball. The person credited with inventing the basketball was G.L. Pierce.
Use this link to research US Patent Numbers: http://patft.uspto.gov/netahtml/PTO/srchnum.htm
United States Patent #51223123 does not exist. The highest US patent number as of 05-28-2010 is 7,725,947.
If it is a U.S. patent, you can go to the USPTO website for patent searches and enter the number in "patent number search". You can obtain the online image of nearly any US patent ever issued (using TIFF format). If you do not know the patent number, you may have to go elsewhere for more information, as the USPTO database prior to 1976 cannot be searched by anything other than the patent number. http://www.uspto.gov/patft/index.html
what is the US patent 878354 A
If it is a U.S. patent, you can go to the USPTO website for patent searches and enter the number in "patent number search".