Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to find patents [title] Search the united states patent and trademark office website. [step] The website for the united states government's patent office lets you search through its patents as far back as 1790. [substeps] You can access the search engine for the u.s. patent and trademark office at uspto. Gov and then follow the links to " patents " and " patent search.

Ending1: " [title] Search the internet to find federal patents. [step] You can search for patents that fall under a federal definition. Ending2: " the u.s patent and trademark office has offices all over the united states. Click the link titled " the u.s. Ending3: " [title] Search for other individual countries' official patent offices. [step] If you are interested in searching for patents in a particular country other than the united states, you can search online for the patent office of that country. Ending4: " e-can is a searchable database of patents and trademark documents. To access this database at uspto.

Answer format: ending1/ending2/ending3/ending4