How do I find an old US patent?
Patents may be searched in the USPTO Patent Full-Text and Image Database (PatFT). The USPTO houses full text for patents issued from 1976 to the present and PDF images for all patents from 1790 to the present.
USPTO Patent Full-Text and Image Database (PatFT)
- Quick Search.
- Advanced Search.
- Patent Number Search.
How do I get a copy of an old patent?
You must have a USPTO.gov account to order certified copies of patent and trademark documents. To view your previous order history, link your USPTO.gov account to your online document ordering system account. Only online orders (not fax or email orders) are viewable online.
How do I find patent file history?
If you need to obtain a US patent file history, we recommend that you first check the Public PAIR (Patent Application Information Retrieval) system of the US Patent and Trademark Office (USPTO).
How do I find an existing patent?
Start at uspto.gov/patft. Next, under the heading Related USPTO Services, click on Tools to Help Searching by Patent Classification. You can now start searching. Patent searches may also be done at google.com/patents and at a number of other free sites.
How do I find 19th century patents?
Patent searching can be done directly on the USPTO’s web site. Full text and images are available for patents from 1976 to the most recent Tuesday. Images, current classification numbers and patent numbers only are available for patents from 1790 to 1975.
How do I search for a patent before 1976?
Patents produced before 1976 can be tricky to find. If you have the patent number, or are searching for all the patents produced with a specific classification number, you can do this on the USPTO web site. Click on “Quick Search” in the green Issued Patents box.
Are patents public records?
This way invention is encouraged through the monopoly to the inventor and technological arts and sciences are advanced by the disclosure of the invention to the public. Therefore the content of a patent is publicly available information.
Where are patents stored?
The principal location of the USPTO is 600 Dulany Street, Alexandria, Virginia. The personal presence of applicants at the USPTO is unnecessary. You do not have to be a Registered eFiler to file a patent application via EFS-Web.