What might a URI for a patent look like?
http://www.uspto.gov/patents/p6678889
Note that this is globally unambiguous; better than "6678889"
Search produced this URI for search on "hypertext":
http://patft.uspto.gov/...s1=hypertext&OS=hypertext...
Search produced this URI for search by patent number 6,678,899:
http://patft.uspto.gov/...s1=6,678,889.WKU....
Why are these URIs different if this is the same patent?