Patents from 1790 through 1975 are searchable only by Issue Date, Patent Number, and Current US Classification. If a search using another field is attempted it will result in an error.
Short video tutorials for performing patent and trademark searches. Some of the information is specific to MIT, but much of it is universally applicable.
Provides a systematic introduction to the work and views of the emerging patent-search research and innovation communities as well as an overview of what has been achieved and, perhaps even more importantly, of what remains to be achieved.
Current Challenges in Patent Information Retrieval by 
Patent searching : tools & techniques by 
