Table of Contents

Searching IFI Patent Status

As you can see from the list of values for IFI Patent Status, many of the possible status values contain similar wording, so it is important to be precise when searching ifi_patstat.

Searching for the terms "active" or "expired" will return inclusive results. For example, searching for "active" will return all records containing the statuses "Active" or "Active - Reinstated", while searching for "expired" will return all records containing a status of "Expired", "Expired - Lifetime", or "Expired- Fee Related".

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ifi_patstat:(not-in-force OR expired OR withdrawn OR ceased OR revoked OR abandoned)

Searching the Anticipated and Adjusted Expiration Date Fields

The anticipated and adjusted expiration date fields can be useful in searching. However, one must be careful.

For example, if you want to see how many US grants expire in 2020, it is important to note that the ifi_expdyear_adj field is only present in a record if there has been a term adjustment or extension. When there is no adjustment or extension, there is no adjusted expiration date. Therefore, you must use the anticipated expiration date.

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