Alternatively, you can go to the Quick Search Page, select which year(s) you want to search by using the Select years to search menu, type the patent number in the Term 1 text entry box, and select 'Patent Number' from the Field 1 menu. Then hit the 'Search' button.
Note: If you are not sure of the issue date, search all years in the database by selecting the all years range, 1976 to date, from the Select years to search menu. You can also click on the Database Contents Page for a table listing all patent numbers and issue years since 1976.
To search for a patent number using the Advanced Search Page, use this syntax:
PN/number
Where number is the number of the patent for which you want to view. Non-utility patents must include a prefix: 'D' for design patents, 'PP' for plant patents, 'RE' for reissue patents, 'T' for defensive publications, and 'H' for SIRs.
class/subclass (for example, 2.5)
Note subclasses can contain decimal or alpha modifiers (for example, 427/2.31 or 427.3A)
You can also search for class/subclass on the Advanced Search Page by using this syntax:
CCL/class/subclass
Further information on searching by class is available on the Field Search Help Page.
How do I search for a particular type of patent, e.g., a design
patent?
What are Stopwords?
Stopwords are terms that appear so frequently in patent text that they lose their usefulness as search terms. Examples are "and", "or", and "the". Although they are not indexed as search terms, they will be displayed in your search results.