Searching the Patent Assignee Field

This is one of the more complex "fields" in patent searching. AcclaimIP uses multiple assignee name fields to keep everything straight, and to give you the power you need to efficiently search assignee names.  This article is designed to give you a quick start.  More details on Assignee Name searching can be found in our Advanced Syntax section.

Current vs. Original vs. Ultimate Assignee

Patents change hands through various means, such as through the acquisition of a company or the purchase of individual patents.  Therefore, the current assignee may not be the same as it appears on the patent.  

Original Assignee

For the purposes of consistency we use the term Original Assignee (i.e., the Assignee (Original) column) which is often called the Applicant.  These are the same.

When an application is published or a patent is granted there is often (but not always) an assignee name printed on the document.  This is the Original Assignee.  

Current Assignee

For a patent to have a different Current Assignee listed in AcclaimIP, two conditions must be met.

  1. It must have changed hands (usually through some kind of civil contract).
  2. It must be registered with the patent office.

There have been countless cases where an acquisition occurs but only the involved parties are aware of the transaction.  In other words, keep in mind that there may be cases where the current assignees listed by the various patent offices (and thus by AcclaimIP) are not the actual current assignees.

Ultimate Assignee

The Ultimate Assignee in AcclaimIP is the top of the corporate tree. This means that just because an assignee has subsidiaries, it is not the Ultimate Assignee. It has to be the top assignee of the corporate hierarchy.

Did You Know?

Despite there being no requirement in many jurisdictions (including the US) to register the assignment of a patent to a new owner, many are still registered.  For example, in 2013, there were almost 64,000 patents that changed hands and did get registered with the USPTO.  To find them, use this special query in AcclaimIP:


Learn more about this query in our Advanced Syntax section.

You can search for patents owned by a particular assignee using the Patent Owners search tab.  The system uses suggestions and includes the facets (counts), but does require a minimum of 3 characters.  

  1. Open up the Patent Owners search tab.
  2. Select Current, Original, or Ultimate from the assignee radio buttons.
  3. Type the first few letters of the assignee name (here I am using the example "US Navy").
  4. Check the suggested version(s) you want to search
  5. Click the Search button.

Notice in this example there are other names that don't have the words "US Navy."  These are co-assigned patents (patent with more than one assignee name listed).  If you check both the "US NAVY" and "UNIV MICHIGAN" options, you'll find the top results are the patents co-assigned to both entities.  

When you search using the Patent Owners tab, you can only search the normalized version of the assignee name.  

Advanced Trick:

If you want to find an assignee name with a particular misspelling you can use the advanced syntax field code AN_ORIG:.  The normalized fields are helpful but we always keep the original version with the bad punctuation and misspellings and all (on any Document Details, clicking the "from..." next to a normalized name will show you the raw, or un-normalized, data. See below).  For example:

AN_ORIG:Siemans  (Siemens is misspelled here)  --> Finds patents that were granted with this misspelling.


Normalized Assignee Names

Assignee names are normalized in AcclaimIP.  It is almost impossible to work with assignee name fields if they are not.  For example, there are over a thousand different versions of "US NAVY" in our database, and this does NOT include differences in punctuation!  

You can tell if a name is normalized if you see it in ALL UPPER CASE LETTERS across the entire field and there is no punctuation in the name.

Note that there is an asterisk (*) in front of one of the names. This is a "guessed" name in the system, based on various pieces of information (e.g., inventor name). 

Assignee Name Normalization is an Ongoing Process

Each week we normalize 100's of new assignee names.  If you find a company that has not been normalized, or a new variant that crept into the mix, just let us know and we'll work to take care of it.

Once you embrace our advanced search you probably won't go back.  

  1. Search using Advanced Syntax right in the Query Builder (1) window.
  2. Your query will be echoed in the Refine Search panel's Search field (2) where you can edit it and refine your search.

Although you can find these by typing assignee in the Field column, it's good to try and start committing to memory the following four field codes you can use to search assignee names.

ANC:  Assignee Normalized Current

The ANC field code searches the current assignee name field in the normalized version.  For example:

ANC:IBM or ANC:(Google OR "Motorla Mobility")

ANO: Assignee Normalized Original

The ANO field code searches the original assignee name field.  For example:

ANO:(Hewlett Packard)

AN:  Assignee Name

The AN field code searches all assignee name fields except ANU (e.g., Original, Current, in the Chain of Custody, and unnormalized assignee fields).  This is a good catch-all search.  For example:

AN:(Bose Corp)

ANU: Assignee Normalized Ultimate

The ANU field code searches the ultimate assignee name field. There is no un-normalized ultimate assignee name in the system. For example:


Un-Normalized Names Appear in the Document Details Window

You can always see the original name as written on the patent by opening the document details window.  There you can see the un-normalized version of both the original and current assignee name.

Notice the normalized versions (1) of the name in the Search Results grid.  This will match the fields in the Document Details window.  It is inefficient to use un-normalized names in the grid, so they are always normalized.

If you want to see the un-normalized name, in the Document Details window click on the ellipses (2) next to the normalized assignee name.

In this example, I have already clicked the ellipses for the Assignee Original (3).  Notice that "UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY,THE" is spelled out completely and with punctuation.  This is how it is written on this patent.  The normalized name has no punctuation.


Click the names in either the Assignee Cur. or Assignee Orig. fields (either normalized or not) to search for instances of that version of the name in the respective field.  Clicking the name will bring up a new search results window with the correct search in the Refine Search panel.

On the other hand, clicking the (list...) next to the Assignee (Ultimate) will bring up the list of Current Assignees under that particular Ultimate Assignee.


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